Subjects -> ASTRONOMY (Total: 94 journals)
Showing 1 - 46 of 46 Journals sorted alphabetically
Advances in Astronomy     Open Access   (Followers: 49)
Annual Review of Astronomy and Astrophysics     Full-text available via subscription   (Followers: 50)
Annual Review of Earth and Planetary Sciences     Full-text available via subscription   (Followers: 67)
Artificial Satellites     Open Access   (Followers: 21)
Astrobiology     Hybrid Journal   (Followers: 11)
Astronomical & Astrophysical Transactions: The Journal of the Eurasian Astronomical Society     Hybrid Journal   (Followers: 7)
Astronomical Review     Open Access   (Followers: 5)
Astronomische Nachrichten     Hybrid Journal   (Followers: 4)
Astronomy & Geophysics     Hybrid Journal   (Followers: 49)
Astronomy and Astrophysics     Full-text available via subscription   (Followers: 67)
Astronomy and Computing     Hybrid Journal   (Followers: 6)
Astronomy Letters     Hybrid Journal   (Followers: 22)
Astronomy Reports     Hybrid Journal   (Followers: 22)
Astronomy Studies Development     Open Access   (Followers: 15)
Astroparticle Physics     Hybrid Journal   (Followers: 10)
Astrophysical Bulletin     Hybrid Journal   (Followers: 4)
Astrophysics     Hybrid Journal   (Followers: 35)
Astrophysics and Space Science     Hybrid Journal   (Followers: 49)
Astrophysics and Space Sciences Transactions (ASTRA)     Open Access   (Followers: 60)
Astropolitics: The International Journal of Space Politics & Policy     Hybrid Journal   (Followers: 13)
Celestial Mechanics and Dynamical Astronomy     Hybrid Journal   (Followers: 15)
Chinese Astronomy and Astrophysics     Full-text available via subscription   (Followers: 25)
Colloid Journal     Hybrid Journal   (Followers: 2)
Comptes Rendus : Physique     Open Access   (Followers: 2)
Computational Astrophysics and Cosmology     Open Access   (Followers: 6)
Earth and Planetary Science Letters     Hybrid Journal   (Followers: 143)
Earth, Moon, and Planets     Hybrid Journal   (Followers: 47)
Earth, Planets and Space     Open Access   (Followers: 77)
EAS Publications Series     Full-text available via subscription   (Followers: 8)
EPL Europhysics Letters     Partially Free   (Followers: 8)
Experimental Astronomy     Hybrid Journal   (Followers: 38)
Expert Opinion on Astronomy and Astrophysics     Open Access   (Followers: 8)
Extreme Life, Biospeology & Astrobiology - International Journal of the Bioflux Society     Full-text available via subscription   (Followers: 4)
Few-Body Systems     Hybrid Journal   (Followers: 1)
Foundations of Physics     Hybrid Journal   (Followers: 40)
Frontiers in Astronomy and Space Sciences     Open Access   (Followers: 15)
Galaxies     Open Access   (Followers: 6)
Globe, The     Full-text available via subscription   (Followers: 3)
Gravitation and Cosmology     Hybrid Journal   (Followers: 6)
Icarus     Hybrid Journal   (Followers: 71)
International Journal of Advanced Astronomy     Open Access   (Followers: 21)
International Journal of Astrobiology     Hybrid Journal   (Followers: 4)
International Journal of Astronomy     Open Access   (Followers: 22)
International Journal of Astronomy and Astrophysics     Open Access   (Followers: 36)
International Journal of Satellite Communications Policy and Management     Hybrid Journal   (Followers: 15)
International Letters of Chemistry, Physics and Astronomy     Open Access   (Followers: 8)
ISRN Astronomy and Astrophysics     Open Access   (Followers: 14)
Journal for the History of Astronomy     Full-text available via subscription   (Followers: 20)
Journal of Astrobiology & Outreach     Open Access   (Followers: 5)
Journal of Astronomical Instrumentation     Open Access   (Followers: 3)
Journal of Astrophysics     Open Access   (Followers: 33)
Journal of Astrophysics and Astronomy     Open Access   (Followers: 58)
Journal of Atmospheric and Solar-Terrestrial Physics     Hybrid Journal   (Followers: 133)
Journal of Geophysical Research : Planets     Full-text available via subscription   (Followers: 116)
Journal of Geophysical Research : Space Physics     Full-text available via subscription   (Followers: 136)
Journal of High Energy Astrophysics     Full-text available via subscription   (Followers: 25)
Kinematics and Physics of Celestial Bodies     Hybrid Journal   (Followers: 11)
KronoScope     Hybrid Journal   (Followers: 1)
Macalester Journal of Physics and Astronomy     Open Access   (Followers: 5)
Monthly Notices of the Royal Astronomical Society     Hybrid Journal   (Followers: 13)
Monthly Notices of the Royal Astronomical Society : Letters     Hybrid Journal   (Followers: 2)
Nature Astronomy     Hybrid Journal   (Followers: 14)
New Astronomy     Hybrid Journal   (Followers: 26)
New Astronomy Reviews     Full-text available via subscription   (Followers: 19)
Nonlinear Dynamics     Hybrid Journal   (Followers: 19)
NRIAG Journal of Astronomy and Geophysics     Open Access   (Followers: 4)
Physics of the Dark Universe     Open Access   (Followers: 4)
Planetary and Space Science     Hybrid Journal   (Followers: 106)
Planetary Science     Open Access   (Followers: 52)
Proceedings of the International Astronomical Union     Full-text available via subscription   (Followers: 2)
Publications of the Astronomical Society of Australia     Hybrid Journal   (Followers: 3)
Publications of the Astronomical Society of Japan     Hybrid Journal   (Followers: 4)
Research & Reviews : Journal of Space Science & Technology     Full-text available via subscription   (Followers: 20)
Research in Astronomy and Astrophysics     Full-text available via subscription   (Followers: 38)
Revista Mexicana de Astronomía y Astrofísica     Open Access   (Followers: 3)
Science China : Physics, Mechanics & Astronomy     Full-text available via subscription   (Followers: 4)
Science China Physics, Mechanics & Astronomy     Hybrid Journal   (Followers: 4)
Solar Physics     Hybrid Journal   (Followers: 29)
Solar System Research     Hybrid Journal   (Followers: 15)
Space Science International     Open Access   (Followers: 118)
Space Science Reviews     Hybrid Journal   (Followers: 92)
Space Weather     Full-text available via subscription   (Followers: 27)
Transport and Aerospace Engineering     Open Access   (Followers: 13)
Universe     Open Access   (Followers: 6)
Similar Journals
Journal Cover
Proceedings of the International Astronomical Union
Journal Prestige (SJR): 0.117
Number of Followers: 2  
 
  Full-text available via subscription Subscription journal
ISSN (Print) 1743-9213 - ISSN (Online) 1743-9221
Published by Cambridge University Press Homepage  [353 journals]
  • Recent insights into massive galaxy formation from observing structural
           evolution (Review)

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      Authors: Newman; Andrew B.
      Pages: 3 - 10
      Abstract: New observations are probing the structures and kinematics of massive galaxies at a much greater level of detail than previously possible, especially during the first half of cosmic history. ALMA data now resolve the distribution of dust and molecular gas in massive galaxies to z ˜ 5. The stellar kinematics of several massive galaxies at z ˜ 2 – 3 have been spatially resolved using gravitational lensing, providing new information on the connection between quenching and morphological transformation. Star formation histories have been reconstructed for growing samples at z ˜ 0.8–2, revealing a wide range of timescales that correlate with galaxies’ sizes and environments, providing evidence for multiple paths to quiescence. I review these and other developments and summarize the insights they have provided into massive galaxies’ evolution.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002306
       
  • Models for galaxy and massive black hole formation and early evolution

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      Authors: Weinberger; Rainer
      Pages: 11 - 16
      Abstract: Models for massive black holes are a key ingredient for modern cosmological simulations of galaxy formation. The necessity of efficient AGN feedback in these simulations makes it essential to model the formation, growth and evolution of massive black holes, and parameterize these complex processes in a simplified fashion. While the exact formation mechanism is secondary for most galaxy formation purposes, accretion modeling turns out to be crucial. It can be informed by the properties of the high redshift quasars, accreting close to their Eddington limit, by the quasar luminosity function at peak activity and by low-redshift scaling relations. The need for halo-wide feedback implies a feedback-induced reduction of the accretion rate towards low redshift, amplifying the cosmological trend towards lower accretion rates at low redshift.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001751
       
  • Tracing young SMBHs in the dusty distant universe – a Chandra view
           of DOGs

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      Authors: Menéndez-Delmestre; Karín, Riguccini, Laurie, Treister, Ezequiel
      Pages: 17 - 21
      Abstract: The coexistence of star formation and AGN activity has geared much attention to dusty galaxies at high redshifts, in the interest of understanding the origin of the Magorrian relation observed locally, where the mass of the stellar bulk in a galaxy appears to be tied to the mass of the underlying supermassive black hole. We exploit the combined use of far-infrared (IR) Herschel data and deep Chandra ˜160 ksec depth X-ray imaging of the COSMOS field to probe for AGN signatures in a large sample of>100 Dust-Obscured Galaxies (DOGs). Only a handful (˜20%) present individual X-ray detections pointing to the presence of significant AGN activity, while X-ray stacking analysis on the X-ray undetected DOGs points to a mix between AGN activity and star formation. Together, they are typically found on the main sequence of star-forming galaxies or below it, suggesting that they are either still undergoing significant build up of the stellar bulk or have started quenching. We find only ˜30% (6) Compton-thick AGN candidates (NH> 1024 cm–2), which is the same frequency found within other soft- and hard-X-ray selected AGN populations. This suggests that the large column densities responsible for the obscuration in Compton-thick AGNs must be nuclear and have little to do with the dust obscuration of the host galaxy. We find that DOGs identified to have an AGN share similar near-IR and mid-to-far-IR colors, independently of whether they are individually detected or not in the X-ray. The main difference between the X-ray detected and the X-ray undetected populations appears to be in their redshift distributions, with the X-ray undetected ones being typically found at larger distances. This strongly underlines the critical need for multiwavelength studies in order to obtain a more complete census of the obscured AGN population out to higher redshifts. For more details, we refer the reader to Riguccini et al. (2019).
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320004032
       
  • High-redshift starbursts as progenitors of massive galaxies

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      Authors: Gómez-Guijarro; Carlos
      Pages: 22 - 26
      Abstract: Starbursting dust-rich galaxies are capable of assembling large amounts of stellar mass very quickly. They have been proposed as progenitors of the population of compact massive quiescent galaxies at z ˜ 2. To test this connection, we present a detailed spatially-resolved study of the stars, dust, and stellar mass in a sample of six submillimeter-bright starburst galaxies at z ˜ 4.5. We found that the systems are undergoing minor mergers and the bulk star formation is located in extremely compact regions. On the other hand, optically-compact star forming galaxies have also been proposed as immediate progenitors of compact massive quiescent galaxies. Were they formed in slow secular processes or in rapid merger-driven starbursts' We explored the location of galaxies with respect to star-forming and structural relations and study the burstiness of star formation. Our results suggest that compact star-forming galaxies could be starbursts winding down and eventually becoming quiescent.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002380
       
  • Variable radio AGN at high redshift identified in the VLA Sky Survey

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      Authors: Nyland; Kristina, Dong, Dillon, Patil, Pallavi, Lacy, Mark, Kimball, Amy, Hallinan, Gregg, Sarbadhicary, Sumit, Polisensky, Emil, Kassim, Namir, Peters, Wendy, Clarke, Tracy, Mukherjee, Dipanjan, van Velzen, Sjoert, Baldassare, Vivienne
      Pages: 27 - 32
      Abstract: As part of an on-going study of radio transients in Epoch 1 (2017–2019) of the Very Large Array Sky Survey (VLASS), we have discovered a sample of 0.2 < z < 3.2 active galactic nuclei (AGN) selected in the optical/infrared that have recently brightened dramatically in the radio. These sources would have previously been classified as radio-quiet based on upper limits from the Faint Images of the Radio Sky at Twenty-centimeters (FIRST; 1993-2011) survey; however, they are now consistent with radio-loud quasars. We present a quasi-simultaneous, multi-band (1–18 GHz) VLA follow-up campaign of our sample of AGN with extreme radio variability. We conclude that the radio properties are most consistent with AGN that have recently launched jets within the past few decades, potentially making them among the youngest radio AGN known.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001921
       
  • The evolution of star formation in QSOs according to WISE

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      Authors: Cutiva-Alvarez; K. A., Coziol, R., Torres-Papaqui, J. P., Andernach, H., Robleto-Orús, A. C.
      Pages: 33 - 34
      Abstract: Using WISE data, we calibrated the W2-W3 colors in terms of star formation rates (SFRs) and applied this calibration to a sample of 1285 QSOs with the highest flux quality, covering a range in redshift from z ˜ 0.3 to z ˜ 3.8. According to our calibration, the SFR increases continuously, reaching a value at z ˜ 3.8 about 3 times higher on average than at lower redshift. This increase in SFR is accompanied by an increase of the BH mass by a factor 100 and a gradual increase of the mean Eddington ratio from 0.1 to 0.3 up to z ˜ 1.5 – 2.0, above which the ratio stays constant, despite a significant increase in BH mass. Therefore, QSOs at high redshifts have both more active BHs and higher levels of star formation activity.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001659
       
  • Feedback from central massive black holes in galaxies using cosmological
           simulations

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      Authors: Barai; Paramita
      Pages: 35 - 36
      Abstract: Gas accretion onto central supermassive black holes of active galaxies and resulting energy feedback, is an important component of galaxy evolution, whose details are still unknown especially at early cosmic epochs. We investigate BH growth and feedback in quasar-host galaxies at z ⩾ 6 by performing cosmological hydrodynamical simulations. We simulate the 2R200 region around a 2 × 1012 Mʘ halo at z = 6, inside a (500 Mpc)3 comoving volume, using the zoom-in technique. We find that BHs accrete gas at the Eddington rate over z = 9–6. At z = 6, our most-massive BH has grown to MBH = 4 × 109 Mʘ. Star-formation is quenched over z = 8–6.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002021
       
  • Substructure in black hole scaling diagrams and implications for the
           coevolution of black holes and galaxies

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      Authors: Davis; Benjamin L., Sahu, Nandini, Graham, Alister W.
      Pages: 37 - 39
      Abstract: Our multi-component photometric decomposition of the largest galaxy sample to date with dynamically-measured black hole masses nearly doubles the number of such galaxies. We have discovered substantially modified scaling relations between the black hole mass and the host galaxy properties, including the spheroid (bulge) stellar mass, the total galaxy stellar mass, and the central stellar velocity dispersion. These refinements partly arose because we were able to explore the scaling relations for various sub-populations of galaxies built by different physical processes, as traced by the presence of a disk, early-type versus late-type galaxies, or a Sérsic versus core-Sérsic spheroid light profile. The new relations appear fundamentally linked with the evolutionary paths followed by galaxies, and they have ramifications for simulations and formation theories involving both quenching and accretion.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001726
       
  • Classification and photometric redshift estimation of quasars in
           photometric surveys

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      Authors: Izuti Nakazono; L. M., Mendes de Oliveira, C., Hirata, N. S. T., Jeram, S., Gonzalez, A., Eikenberry, S., Queiroz, C., Abramo, R., Overzier, R.
      Pages: 40 - 41
      Abstract: We present a machine learning methodology to separate quasars from galaxies and stars using data from S-PLUS in the Stripe-82 region. In terms of quasar classification, we achieved 95.49% for precision and 95.26% for recall using a Random Forest algorithm. For photometric redshift estimation, we obtained a precision of 6% using k-Nearest Neighbour.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001829
       
  • Dark matter content of ETGs and its relation to the local density of
           galaxies

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      Authors: Nigoche-Netro; A., Ramos-Larios, G., Díaz, R., de la Fuente, E., Lagos, P., Ruelas-Mayorga, A., Mendez-Abreu, J., Kemp, S. N.
      Pages: 42 - 45
      Abstract: We study the behaviour of the dynamical and stellar mass inside the effective radius as function of local density for early-type galaxies (ETGs). We use several samples of ETGs - ranging from 19000 to 98000 objects - from the ninth data release of the Sloan Digital Sky Survey. We consider Newtonian dynamics, different light profiles and different initial mass functions (IMF) to calculate the dynamical and stellar mass. We assume that any difference between these two masses is due to dark matter and/or a non-universal IMF. The main results are: (i) the amount of dark matter (DM) inside ETGs depends on the environment; (ii) ETGs in low-density environments span a wider DM range than ETGs in dense environments; (iii) the amount of DM inside ETGs in the most dense environments will be less than approximately 55-65 per cent of the dynamical mass; (iv) the accurate value of this upper limit depends on the impact of the IMF on the stellar mass estimation.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320004007
       
  • Cosmological forecasts from photometric measurements of the angular
           correlation function for the Legacy Survey of Space and Time

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      Authors: de Souza; Diogo H. F., Santiago, Basílio X.
      Pages: 46 - 48
      Abstract: We aim to do forecasts for the Legacy Survey of Space and Time (LSST) with a theoretical modeling of the two point angular correlation function. The Fisher matrix is the starting point. This is a square matrix over the cosmological parameters, whose diagonal contains direct informations on the parameters expected uncertainties.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001878
       
  • The role of AGN feedback in the baryon cycle at z ∼ 2

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      Authors: Mainieri; Vincenzo
      Pages: 51 - 56
      Abstract: In this proceeding I will summarize our on-going observational campaign to characterize Active Galactic Nuclei (AGN) driven ionized gas outflows at z ˜ 2 and assess their impact on galaxy evolution. The results are mostly derived from a recently completed SINFONI/VLT Large Programme named SUPER, conducted with Adaptive Optics to reach a spatial resolution of ˜2 kpc at z ˜ 2.
      PubDate: 2021-03-29
      DOI: 10.1017/S174392132000232X
       
  • Quasar black hole masses and accretion rates across cosmic time

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      Authors: Brotherton; Michael, Maithil, Jaya, Myers, Adam, Shemmer, Ohad, Matthews, Brandon, Dix, Cooper, Du, Pu, Wang, Jian-Min
      Pages: 57 - 61
      Abstract: Quasar black hole masses are most commonly estimated using broad emission lines in single epoch spectra based on scaling relationships determined from reverberation mapping of small samples of low-redshift objects. Several effects have been identified requiring modifications to these scaling relationships, resulting in significant reductions of the black hole mass determinations at high redshift. Correcting these systematic biases is critical to understanding the relationships among black hole and host galaxy properties. We are completing a program using the Gemini North telescope, called the Gemini North Infrared Spectrograph (GNIRS) Distant Quasar Survey (DQS), that has produced rest-frame optical spectra of about 200 high-redshift quasars (z = 1.5–3.5). The GNIRS-DQS will produce new and improved ultraviolet-based black hole mass and accretion rate prescriptions, as well as new redshift prescriptions for velocity zero points of high-z quasars, necessary to measure feedback.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002392
       
  • The merger-driven evolution of massive early-type galaxies

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      Authors: Cannarozzo; Carlo, Nipoti, Carlo, Sonnenfeld, Alessandro, Leauthaud, Alexie, Huang, Song, Diemer, Benedikt, Oyarzún, Grecco
      Pages: 62 - 66
      Abstract: The evolution of the structural and kinematic properties of early-type galaxies (ETGs), their scaling relations, as well as their stellar metallicity and age contain precious information on the assembly history of these systems. We present results on the evolution of the stellar mass-velocity dispersion relation of ETGs, focusing in particular on the effects of some selection criteria used to define ETGs. We also try to shed light on the role that in-situ and ex-situ stellar populations have in massive ETGs, providing a possible explanation of the observed metallicity distributions.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002434
       
  • GOODS-ALMA: AGNs and the slow downfall of massive star-forming galaxies at
           z> 2

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      Authors: Franco; Maximilien
      Pages: 67 - 71
      Abstract: We present the results of a 69 arcmin2 ALMA survey at 1.1 mm, GOODS-ALMA, matching the deepest HST-WFC3 H-band observed region of the GOODS-South field. The 35 galaxies detected by ALMA are among the most massive galaxies at z = 2–4 and are either starburst or located in the upper part of the galaxy star-forming main sequence. The analysis of the gas fraction, depletion time, X-ray luminosity and the size suggests that they are building compact bulges and are the ideal progenitors of compact passive galaxies at z˜2, and a slow downfall scenario is favoured in their future transition from star-forming to passive galaxies.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320004214
       
  • The physics of galaxy evolution with SPICA observations

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      Authors: Spinoglio; Luigi, Fernández-Ontiveros, Juan A., Mordini, Sabrina
      Pages: 72 - 77
      Abstract: The evolution of galaxies at Cosmic Noon (1 < z < 3) passed through a dust-obscured phase, during which most stars formed and black holes in galactic nuclei started to shine, which cannot be seen in the optical and UV, but it needs rest frame mid-to-far IR spectroscopy to be unveiled. At these frequencies, dust extinction is minimal and a variety of atomic and molecular transitions, tracing most astrophysical domains, occur. The Space Infrared telescope for Cosmology and Astrophysics (SPICA), currently under evaluation for the 5th Medium Size ESA Cosmic Vision Mission, fully redesigned with its 2.5-m mirror cooled down to T < 8K will perform such observations. SPICA will provide for the first time a 3-dimensional spectroscopic view of the hidden side of star formation and black hole accretion in all environments, from voids to cluster cores over 90% of cosmic time. Here we outline what SPICA will do in galaxy evolution studies.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320004238
       
  • Distant quasar host galaxies and their environments with multi-wavelength
           3D spectroscopy

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      Authors: Vayner; Andrey
      Pages: 78 - 81
      Abstract: We have conducted a multi-wavelength survey of distant (1.3 < z < 2.6) luminous quasars host galaxies using the Keck integral field spectrograph (IFS) OSIRIS and laser guide star adaptive optics (LGS-AO) system, ALMA, HST and VLA. Studying distant quasar host galaxies is essential for understanding the role of active galactic nuclei (AGN) feedback on the interstellar medium (ISM), and its capability of regulating the growth of massive galaxies and their supermassive black holes (SMBH). The combination of LGS-AO and OSIRIS affords the necessary spatial resolution and contrast to disentangle the bright quasar emission from that of its faint host galaxy. We resolve the nebular emission lines, [OIII], [NII],, and [SII] at a sub-kiloparsec resolution to study the distribution, kinematics, and dynamics of the warm-ionized ISM in each quasar host galaxy. The goal of the survey was to search for ionized outflows and relate their spatial extent and energetics to the star-forming properties of the host galaxy. Combining ALMA and OSIRIS, we directly test whether outflows detected with OSIRIS are affecting the molecular ISM. We find that several mechanisms are responsible for driving the outflows within our systems, including radiation pressure in low and high column density environments as well as adiabatic and isothermal shocks driven by the quasar. From line ratio diagnostics, we obtain resolved measurements of the photoionization mechanisms and the gas-phase metallicity. We find that the quasars are responsible for photoionizing the majority of the ISM with metalicities lower than that of gas photoionized by AGN in the low redshift systems. We are now obtaining detailed observations of the circumgalactic medium (CGM) of these systems with the Keck Cosmic Web Imager (KCWI). The gas in the CGM may play an essential role in the evolution of these galaxies.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320004329
       
  • No evidence for quenching in quasars

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      Authors: Wethers; Clare, Acharya, Nischal, De Propris, Roberto, Kotilainen, Jari, Schramm, Malte, Schulze, Andreas
      Pages: 82 - 88
      Abstract: The role of quasar feedback in galaxy evolution remains poorly understood. Throughout this work, we explore the effects of negative feedback on star formation in quasar host galaxies, analysing two distinct populations of quasars. The first is a sample of high-redshift (z> 2) low-ionisation broad absorption line quasars (LoBALs) - a class of quasars hosting energetic mass outflows, in which we find evidence for prolific star formation (>750Mʘyr–1) exceeding that of non-BAL quasars at the same redshift. The second is a population of 207 low-redshift (z < 0.3) quasars, in which we find an enhancement in the SFRs of quasar hosts compared to the underlying galaxy population, with no quasars residing in quiescent hosts over the last 2Gyr. Overall, we find no evidence for galaxy-wide quenching in either population, rather we suggest that the dominant effect of quasar activity is to enhance star formation in the galaxy.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002264
       
  • High density galaxy environments — the radio view

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      Authors: Hardcastle; Martin J.
      Pages: 91 - 98
      Abstract: Radio-loud active galaxies are widely believed to have a strong impact on their environments, and often lie in groups and clusters of galaxies. In this article I summarize what we can understand about the sources’ effects on their surroundings from the perspective of radio galaxy physics, with special reference to the energetics of the impact on the external medium and its inference from large statistical studies of radio galaxies.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002227
       
  • The effects of outbursts from Supermassive Black Holes: A close look at
           M87

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      Authors: Jones; C., Forman, W.
      Pages: 99 - 107
      Abstract: Supermassive black holes (SMBHs) play[-105pt]Kindly check and confirm the Article Title. fundamental roles in the evolution of galaxies, groups, and clusters. The fossil record of supermassive black hole outbursts is seen through the cavities and shocks that are imprinted on these gas-rich systems. For M87, the central galaxy in the Virgo cluster, deep Chandra observations illustrate the physics of AGN feedback in hot, gas-rich atmospheres and allow measurements of the age, duration, and power of the outburst from the supermassive black hole in M87 that produced the observed cavities and shocks in the hot X-ray atmosphere.
      PubDate: 2021-03-29
      DOI: 10.1017/S174392132000407X
       
  • The role of environment on quenching, star formation and AGN activity

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      Authors: Poggianti; Bianca M., Bellhouse, Callum, Deb, Tirna, Franchetto, Andrea, Fritz, Jacopo, George, Koshy, Gullieuszik, Marco, Jaffé, Yara, Moretti, Alessia, Mueller, Ancla, Radovich, Mario, Ramatsoku, Mpati, Vulcani, Benedetta, ,
      Pages: 108 - 116
      Abstract: Galaxies undergoing ram pressure stripping in clusters are an excellent opportunity to study the effects of environment on both the AGN and the star formation activity. We report here on the most recent results from the GASP survey. We discuss the AGN-ram pressure stripping connection and some evidence for AGN feedback in stripped galaxies. We then focus on the star formation activity, both in the disks and the tails of these galaxies, and conclude drawing a picture of the relation between multi-phase gas and star formation.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002070
       
  • The gas-loss evolution in dwarf spheroidal galaxies: Supernova feedback
           and environment effects in the case of the local group galaxy Ursa Minor

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      Authors: Caproni; Anderson, Lanfranchi, Gustavo Amaral
      Pages: 117 - 118
      Abstract: In this work, we performed two distinct non-cosmological, three-dimensional hydrodynamic simulations that evolved the gas component of a galaxy similar to the classical dwarf spheroidal galaxy Ursa Minor. Both simulations take into account types II and Ia supernovae feedback constrained by chemical evolution models, while ram-pressure stripping mechanism is added into one of them considering an intergalactic medium and a galactic velocity that resemble what is observed nowadays for the Ursa Minor galaxy. Our results show no difference in the amount of gas left inside the galaxy until 400 Myr of evolution. Moreover, the ram-pressure wind was stalled and inverted by thermal pressure of the interstellar medium and supernovae feedback during the same interval.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002161
       
  • Supermassive Black Hole feedback in early type galaxies

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      Authors: Forman; W., Jones, C., Bogdan, A., Kraft, R., Churazov, E., Randall, S., Sun, M., O’Sullivan, E., Vrtilek, J., Nulsen, P.
      Pages: 119 - 125
      Abstract: Optically luminous early type galaxies host X-ray luminous, hot atmospheres. These hot atmospheres, which we refer to as coronae, undergo the same cooling and feedback processes as are commonly found in their more massive cousins, the gas rich atmospheres of galaxy groups and galaxy clusters. In particular, the hot coronae around galaxies radiatively cool and show cavities in X-ray images that are filled with relativistic plasma originating from jets powered by supermassive black holes (SMBH) at the galaxy centers. We discuss the SMBH feedback using an X-ray survey of early type galaxies carried out using Chandra X-ray Observatory observations. Early type galaxies with coronae very commonly have weak X-ray active nuclei and have associated radio sources. Based on the enthalpy of observed cavities in the coronae, there is sufficient energy to “balance” the observed radiative cooling. There are a very few remarkable examples of optically faint galaxies that are 1) unusually X-ray luminous, 2) have large dark matter halo masses, and 3) have large SMBHs (e.g., NGC4342 and NGC4291). These properties suggest that, in some galaxies, star formation may have been truncated at early times, breaking the simple scaling relations.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320004081
       
  • The light side of proto-cluster galaxies at z ∼ 4

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      Authors: Ito; Kei
      Pages: 126 - 130
      Abstract: Overdense regions at high redshift, which are often called “protoclusters”, are thought to be a place where the early active structure formations are in progress. Thanks to the wide and deep-sky survey of Hyper Suprime-Cam Subaru Strategic Program, we have selected 179 protocluster candidates at z ˜ 4, enabling us to statistically discuss high-z overdense regions. I report results of the HSC-SSP protocluster project, focusing on a couple of results on the bright-end of protocluster galaxies. We identify the UV-brightest galaxies, which are likely progenitors of Brightest Cluster Galaxies. We find that these are dustier and larger than field galaxies. This suggests that galaxies in protoclusters have experienced different star formation histories at z ˜ 4. Also, the UV luminosity function of galaxies in protoclusters (PC UVLF) has a significant excess on the bright-end from field UVLF. The PC UVLF suggests that protoclusters contribute ˜ 5 – 16% of the total cosmic SFRD at z ˜ 4. The result implies that early galaxy formation occurs in protoclusters.
      PubDate: 2021-03-29
      DOI: 10.1017/S174392132000174X
       
  • Mass outflow of the X-ray emission line gas in NGC 4151

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      Authors: Kraemer; S. B., Turner, T. J., Crenshaw, D. M., Schmitt, H. R., Revalski, M., Fischer, T. C.
      Pages: 131 - 135
      Abstract: We have analyzed Chandra/High Energy Transmission Grating spectra of the X-ray emission line gas in the Seyfert galaxy NGC 4151. The zeroth-order spectral images show extended H- and He-like O and Ne, up to a distance r ˜ 200 pc from the nucleus. Using the 1st-order spectra, we measure an average line velocity ˜230 km s–1, suggesting significant outflow of X-ray gas. We generated Cloudy photoionization models to fit the 1st-order spectra; the fit required three distinct emission-line components. To estimate the total mass of ionized gas (M) and the mass outflow rates, we applied the model parameters to fit the zeroth-order emission-line profiles of Ne IX and Ne X. We determined an M ≍ 5.4 × 105 Mʘ. Assuming the same kinematic profile as that for the [O III] gas, derived from our analysis of Hubble Space Telescope/Space Telescope Imaging Spectrograph spectra, the peak X-ray mass outflow rate is approximately 1.8 Mʘ yr–1, at r ˜ 150 pc. The total mass and mass outflow rates are similar to those determined using [O III], implying that the X-ray gas is a major outflow component. However, unlike the optical outflows, the X-ray emitting mass outflow rate does not drop off at r> 100pc, which suggests that it may have a greater impact on the host galaxy.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001660
       
  • Cold gas studies of a z = 2.5 protocluster

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      Authors: Lee; Minju M., Tanaka, Ichi, Kawabe, Rohei
      Pages: 136 - 140
      Abstract: We present studies of a protocluster at z =2.5, an overdense region found close to a radio galaxy, 4C 23.56, using ALMA. We observed 1.1 mm continuum, two CO lines (CO (4–3) and CO (3–2)) and the lower atomic carbon line transition ([CI](3P1-3P0)) at a few kpc (0″.3-0″.9) resolution. The primary targets are 25 star-forming galaxies selected as Hα emitters (HAEs) that are identified with a narrow band filter. These are massive galaxies with stellar masses of> 1010 Mʘ that are mostly on the galaxy main sequence at z =2.5. We measure the molecular gas mass from the independent gas tracers of 1.1 mm, CO (3–2) and [CI], and investigate the gas kinematics of galaxies from CO (4–3). Molecular gas masses from the different measurements are consistent with each other for detection, with a gas fraction (fgas = Mgas/(Mgas+ Mstar)) of ≃ 0.5 on average but with a caveat. On the other hand, the CO line widths of the protocluster galaxies are typically broader by ˜50% compared to field galaxies, which can be attributed to more frequent, unresolved gas-rich mergers and/or smaller sizes than field galaxies, supported by our high-resolution images and a kinematic model fit of one of the galaxies. We discuss the expected scenario of galaxy evolution in protoclusters at high redshift but future large surveys are needed to get a more general view.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320004226
       
  • The recurrent nuclear activity of Fornax A and its interaction with the
           cold gas

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      Authors: Maccagni; F. M., Serra, P., Murgia, M., Govoni, F., Morokuma-Matsui, K., Kleiner, D.
      Pages: 141 - 146
      Abstract: Sensitive (noise ∼16 μJy beam−1), high-resolution (∼10″) MeerKAT observations of show that its giant lobes have a double-shell morphology, where dense filaments are embedded in a diffuse and extended cocoon, while the central radio jets are confined within the host galaxy. The spectral radio properties of the lobes and jets of reveal that its nuclear activity is rapidly flickering. Multiple episodes of nuclear activity must have formed the radio lobes, for which the last stopped 12 Myr ago. More recently (∼3 Myr ago), a less powerful and short (≲1 Myr) phase of nuclear activity generated the central jets. The distribution and kinematics of the neutral and molecular gas in the centre give insights on the interaction between the recurrent nuclear activity and the surrounding interstellar medium.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320004287
       
  • Diving deeper into jellyfish: The rich population of jellyfish galaxies in
           Abell 901/2

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      Authors: Roman de Oliveira; Fernanda, Chies Santos, Ana, Ferrari, Fabrício, Lucatelli, Geferson
      Pages: 147 - 152
      Abstract: Jellyfish galaxies are the most striking examples of galaxies undergoing ram pressure stripping – the removal of gas as a result of a hydrodynamic friction in dense environments. As part of the OMEGA (OSIRIS Mapping of Emission-line Galaxies in Abell 901/2) survey, we have identified the largest sample of jellyfish galaxies in a single system to this date, located in the Abell 901/2 multi-cluster system at z ˜ 0.165. We present our results with a detailed description of this sample regarding their very high star formation rates and their unique spatial distribution pattern that can be explained as a result of the merging system triggering ram pressure stripping events. Furthermore, we also show the results of our most recent morphometric studies where we use Morfometryka as a tool to characterise the morphologies and structural evolution of jellyfish galaxies. Our morphometric analysis shows that jellyfish galaxy candidates have peculiar concave regions in their surface brightness profiles. Therefore, these profiles are less concentrated (lower Sérsic indices) than other star forming galaxies that are not experiencing such extreme ram pressure effects.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002252
       
  • The intriguing case of Was 49b

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      Authors: Schmitt; Henrique R., Secrest, Nathan J., Blecha, Laura, Rothberg, Barry, Fischer, Jacqueline
      Pages: 153 - 157
      Abstract: We present results of a multiwavelength study of the isolated dual AGN system Was 49. Observations show that the dominant component in this interacting system, Was 49a, is a spiral galaxy, while Was 49b is hosted in a dwarf galaxy located at 8 kpc from the nucleus of Was 49a, at the edge of its disk. The intriguing fact about this system is the luminosity of their corresponding AGNs. While Was 49a hosts a low luminosity Seyfert 2 with Lbol˜1043 erg s–1, Was 49b has a Seyfert 2 with Lbol ˜ 1045 erg s–1, in the luminosity range of Quasars. Furthermore, estimates of the black hole and host galaxy masses of Was 49b indicate a black hole significantly more massive than one would expect from scaling relations. This result is in contrast with findings that the most luminous merger-triggered AGNs are found in major mergers and that minor mergers predominantly enhance AGN activity in the primary galaxy.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002409
       
  • H2 content of galaxies inside and around intermediate redshift clusters

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      Authors: Spérone-Longin; Damien
      Pages: 158 - 162
      Abstract: Dense environments have an impact on the star formation rate of galaxies. As stars form from molecular gas, looking at the cold molecular gas content of a galaxy gives useful insights on its efficiency in forming stars. However, most galaxies observed in CO (a proxy for the cold molecular gas content) at intermediate redshifts, are field galaxies. Only a handful of studies focused on cluster galaxies. I present new results on the environment of one medium mass cluster from the EDisCS survey at z ˜ 0.5. 27 star-forming galaxies were selected to evenly sample the range of densities encountered inside and around the cluster. We cover a region extending as far as 8 virial radii from the cluster center. Indeed there is ample evidence that star formation quenching starts already beyond 3 cluster virial radii. I discuss our CO(3-2) ALMA observations, which unveil a large fraction of galaxies with low gas-to-stellar mass ratios.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001738
       
  • Effects of AGN feedback on galaxy downsizing in different environments

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      Authors: Amiri; Amirnezam, Zubovas, Kastytis, Marconi, Alessandro, Tavasoli, Saeed, Khosroshahi, Habib G.
      Pages: 163 - 165
      Abstract: We have investigated the role of AGN feedback on galaxy downsizing in cluster and void environments, using the sample from Amieri et al. (2019). Our results indicate that, at least in the local universe, the correlation between black hole mass and (specific) star formation rate is statistically indistinguishable in the two environments. Therefore, the role of the environment in modulating AGN feedback effects on the host galaxy star formation is negligible.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001891
       
  • A systematic search for galaxy proto-cluster cores at z ∼ 2

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      Authors: Ando; Makoto, Shimasaku, Kazuhiro, Momose, Rieko
      Pages: 166 - 167
      Abstract: A proto-cluster core is the most massive dark matter halo (DMH) in a given proto-cluster. To reveal the galaxy formation in core regions, we search for proto-cluster cores at z ˜ 2 in ˜1.5deg2 of the COSMOS field. Using pairs of massive galaxies (log (M*/Mʘ) ≥ 11) as tracers of cores, we find 75 candidate cores. A clustering analysis and the extended Press-Schechter model show that their descendant mass at z = 0 is consistent with Fornax-like or Virgo-like clusters. Moreover, using the IllustrisTNG simulation, we confirm that pairs of massive galaxies are good tracers of DMHs massive enough to be regarded as proto-cluster cores. We then derive the stellar mass function and the quiescent fraction for member galaxies of the 75 candidate cores. We find that stellar mass assembly and quenching are accelerated as early as z ˜ 2 in proto-cluster cores.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001933
       
  • Isolated groups of extremely blue dwarf galaxies

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      Authors: Bootz; Vitor, Trevisan, Marina, Thuan, Trinh, Izotov, Yuri, Krabbe, Angela, Dors, Oli
      Pages: 168 - 169
      Abstract: Interactions and mergers between dwarf galaxies are mostly gas-rich and should be marked by an intense star formation activity. But these processes, which are expected to be common at earlier times, are very difficult to observe at low redshifts. To investigate that, we look in the Sloan Digital Sky Survey (SDSS) for compact groups that contain one luminous compact galaxy (LCG) with very high specific star formation rate (sSFR) and at least two other blue galaxies. We found 24 groups that satisfy these criteria, among which 12 groups have SDSS spectroscopic data for at least 2 member galaxies. Here we want to investigate, using the tidal strength estimator Q, how interactions between neighbouring galaxies affect the sSFR and concentration of each LCG. Statistical tests reveal a correlation between Q and their sSFR, indicating that tidal forces between neighbouring galaxies might be inducing bursts of star formation in the LCGs.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001830
       
  • The environmental effect on galaxy evolution: Cl J1449 + 0856 at z = 1.99

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      Authors: Coogan; Rosemary T., Daddi, E., Gobat, R., Sargent, M. T.
      Pages: 170 - 172
      Abstract: This work focuses on understanding the formation of the first massive, passive galaxies in clusters, as a first step to the development of environmental trends seen at low redshift. Cl J1449 + 0856 is an excellent case to study this - a galaxy cluster at redshift z = 1.99 that already shows evidence of a virialised atmosphere. Here we highlight two recent results: the discovery of merger-driven star formation and highly-excited molecular gas in galaxies at the core of Cl J1449, along with the lowest-mass Sunyaev-Zel’dovich detection to date.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002008
       
  • The co-responsibility of mass and environment in the formation of
           lenticular galaxies

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      Authors: Cortesi; A., Coccato, L., Buzzo, M. L., Menéndez-Delmestre, K., Goncalves, T., Mendes de Oliveira, C., Merrifield, M., Arnaboldi, M.
      Pages: 173 - 174
      Abstract: We present the latest data release of the Planetary Nebulae Spectrograph Survey (PNS) of ten lenticular galaxies and two spiral galaxies. With this data set we are able to recover the galaxies’ kinematics out to several effective radii. We use a maximum likelihood method to decompose the disk and spheroid kinematics and we compare it with the kinematics of spiral and elliptical galaxies. We build the Tully- Fisher (TF) relation for these galaxies and we compare with data from the literature and simulations. We find that the disks of lenticular galaxies are hotter than the disks of spiral galaxies at low redshifts, but still dominated by rotation velocity. The mechanism responsible for the formation of these lenticular galaxies is neither major mergers, nor a gentle quenching driven by stripping or Active Galactic Nuclei (AGN) feedback.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001908
       
  • Cosmic magnetism evolution using cosmological simulations

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      Authors: Adduci Faria; Stela, de Gouveia Dal Pino, Elisabete M., Barai, Paramita
      Pages: 175 - 177
      Abstract: The Intergalactic Medium (IGM) is the region comprising the environment between the galaxies. Gamma-ray observations have provided lower limits to IGM magnetic fields of the order of ≳10–16 G. Magnetic fields are continuously ejected from galaxies by jets and galactic winds. However, the origin and evolution of cosmic magnetic fields in the more diffuse regions, like voids, is still debated. The difficulties in directly measuring magnetic fields and their coherent scales, make hydrodynamic and magnetohydrodynamic (MHD) cosmological simulations useful tools to shed light on this debate. As a first approach, we have performed hydrodynamic cosmological simulations assuming energy equipartition as an initial condition between the baryonic gas and the magnetic field, starting at z = 8, to track the evolution of magnetic fields, and compare with results of MHD simulations. We have found that for halos and cores, our results are comparable to the MHD description. For the less dense regions, the equipartition condition clearly overestimates the observed limits. In forthcoming work, we will investigate MHD simulations of cosmological evolution and amplification of seed magnetic fields, considering all relevant feedback processes and exploring turbulent dynamo amplification versus primordial mechanisms across cosmological timescales.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320004019
       
  • Propagation of cosmic rays and their secondaries in the intracluster
           medium

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      Authors: Hussain; Saqib, Alves Batista, Rafael, de Gouveia Dal Pino, Elisabete Maria, Dolag, Klaus
      Pages: 178 - 179
      Abstract: We present results of the propagation of high-energy cosmic rays (CRs) and their secondaries in the intracluster medium (ICM). To this end, we employ three-dimensional cosmological magnetohydrodynamical simulations of the turbulent intergalactic medium to explore the propagation of CRs with energies between 1014 and 1019 eV. We study the interaction of test particles with this environment considering all relevant electromagnetic, photohadronic, photonuclear, and hadronuclear processes. Finally, we discuss the consequences of the confinement of high-energy CRs in clusters for the production of gamma rays and neutrinos.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001805
       
  • AGN feedback and galaxy evolution in nearby galaxy groups using CLoGS

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      Authors: Kolokythas; Konstantinos, ,
      Pages: 180 - 181
      Abstract: Much of the evolution of galaxies takes place in groups where feedback has the greatest impact on galaxy formation and evolution. We summarize results from studies of the central brightest group early-type galaxies (BGEs) of an optically selected, statistically complete sample of 53 nearby groups (
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001507
       
  • Ubiquitous cold and massive filaments in brightest cluster galaxies

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      Authors: Olivares; Valeria, Salomé, Philippe
      Pages: 182 - 184
      Abstract: The origin of the mysterious multiphase filamentary structures surrounding Brightest Cluster Galaxies (BCGs) remains unknown. We present Atacama Large Millimeter/submillimeter Array (ALMA) and Multi Unit Spectroscopic Explorer (MUSE) observations for a sample of 15 BCGs to investigate the origin and life-cycle of the gas. Those observations show clumpy and massive molecular filaments, preferentially located around the radio bubbles inflated by the active galactic nuclei (AGN). We investigate where the cold gas condenses from the intra-cluster medium, by comparing the radial extent of the filaments with predictions from numerical simulations.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002355
       
  • Excitation mechanism in the intracluster filaments surrounding the
           Brightest Cluster Galaxies

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      Authors: Polles; Fiorella L.
      Pages: 185 - 187
      Abstract: Multi-phase filamentary structures surrounding giant elliptical galaxies at the center of cool-core clusters, the Brightest Cluster Galaxies (BCGs), have been detected from optical to submillimeter wavelengths. The source of the ionisation in the filaments is still debated. Studying the excitation of these structures is key to our understanding of Active Galactic Nuclei (AGN) feedback in general, and more precisely of the impact of environmental and local effects on star formation. One possible contributor to the excitation of the filaments is the thermal radiation from the cooling of the hot plasma surrounding the BCGs, the so-called cooling flow.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002343
       
  • Investigating the properties of a galaxy group at z = 0.6

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      Authors: Okido; Daniela Hiromi, Furlanetto, Cristina, Trevisan, Marina, Tergolina, Mônica
      Pages: 188 - 189
      Abstract: Galaxy groups offer an important perspective on how the large-scale structure of the Universe has formed and evolved, being great laboratories to study the impact of the environment on the evolution of galaxies. We aim to investigate the properties of a galaxy group that is gravitationally lensing HELMS18, a submillimeter galaxy at z = 2.39. We obtained multi-object spectroscopy data using Gemini-GMOS to investigate the stellar kinematics of the central galaxies, determine its members and obtain the mass, radius and the numerical density profile of this group. Our final goal is to build a complete description of this galaxy group. In this work we present an analysis of its two central galaxies: one is an active galaxy with z = 0.59852 ± 0.00007, while the other is a passive galaxy with z = 0.6027 ± 0.0002. Furthermore, the difference between the redshifts obtained using emission and absorption lines indicates an outflow of gas with velocity v = 278.0 ± 34.3 km/s relative to the galaxy.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001945
       
  • Post-starburst galaxies in different environments

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      Authors: Spindler; Rodolfo, Trevisan, Marina, Schnorr-Müller, Allan
      Pages: 190 - 191
      Abstract: Post-starburst galaxies (PSBGs) are systems that experienced a burst followed by a rapid quenching of star formation. However, it is still unclear what causes these events and what is the environmental role in the origin of PSBGs. To address this, we analysed sizes, morphologies, ages, and metallicities of PSBGs at 0.05 ≤ z ≤ 0.1 in groups and clusters of galaxies. We find a statistically significant excess of compact PSBGs in groups compared to a control sample of passive galaxies. Satellite PSBGs in groups tend to be more compact compared to their counterparts in clusters. Additionally, the PSBGs in groups have smaller T-type values and are likely to be found in inner group regions compared to PSBGs in clusters. Our results are compatible with dissipative wet merger events being an important mechanism responsible for the origin of PSBGs in groups, but other – less dissipative – processes may be producing PSBGs in cluster environments.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002136
       
  • Testing the link between mergers and AGN in the Arp 245 system

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      Authors: Lösch; Elismar, Ruschel-Dutra, Daniel
      Pages: 192 - 194
      Abstract: Galaxy mergers are known to drive an inflow of gas towards galactic centers, potentia- lly leading to both star formation and nuclear activity. In this work we aim to study how a major merger event in the ARP 245 system is linked with the triggering of an active galactic nucleus (AGN) in the NGC galaxy 2992. We employed three galaxy collision numerical simulations and calculated the inflow of gas through four different concentric spherical surfaces around the galactic centers, estimating an upper limit for the luminosity of an AGN being fed the amount of gas crossing the innermost spherical surface. We found that these simulations predict reasonable gas inflow rates when compared with the observed AGN luminosity in NGC 2992.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001842
       
  • Nuclear Star Clusters in Coma confirmation of an unusually high nucleation
           fraction

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      Authors: Zanatta; Emilio, Sanchez-Janssen, Ruben, Chies-Santos, Ana L.
      Pages: 195 - 200
      Abstract: Nuclear star clusters (NSCs) are stellar systems similar in size to globular clusters (GCs) but extremely dense, comparable only to some GCs and ultra-compact dwarfs. They are present in galaxies with a wide range of masses, morphologies and gas content. There are several formation scenarios proposed for the formation of such objects, such as the merger of GCs or extreme star formation caused by the inflow of gas. Recent studies show that the presence of an NSC is related to galaxy stellar mass. Moreover, it has been suggested that NSCs are more often found in high density environments. In our work, we use deep imaging of the core regions of the Coma cluster down to an absolute magnitude of –8.2 and found that in this environment the nucleation fraction is higher than in the Virgo and Fornax clusters. We find nucleated galaxies in Coma as faint as –11.2 mag.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320004263
       
  • Establishing the impact of powerful AGN on their host galaxies

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      Authors: Harrison; C. M., Molyneux, S. J., Scholtz, J., Jarvis, M. E.
      Pages: 203 - 211
      Abstract: Establishing the role of active galactic nuclei (AGN) during the formation of galaxies remains one of the greatest challenges of galaxy formation theory. Towards addressing this, we summarise our recent work investigating: (1) the physical drivers of ionised outflows and (2) observational signatures of the impact by jets/outflows on star formation and molecular gas content in AGN host galaxies. We confirm a connection between radio emission and extreme ionised gas kinematics in AGN hosts. Emission-line selected AGN are significantly more likely to exhibit ionised outflows (as traced by the [O iii] emission line) if the projected linear extent of the radio emission is confined within the spectroscopic aperture. Follow-up high resolution radio observations and integral field spectroscopy of 10 luminous Type 2 AGN reveal moderate power, young (or frustrated) jets interacting with the interstellar medium. We find that these sources live in highly star forming and gas rich galaxies. Additionally, by combining ALMA-derived dust maps with integral field spectroscopy for eight host galaxies of z ≈ 2 X-ray AGN, we show that Hα emission is an unreliable tracer of star formation. For the five targets with ionised outflows we find no dramatic in-situ shut down of the star formation. Across both of these studies we find that if these AGN do have a negative impact upon their host galaxies, it must be happening on small (unresolved) spatial scales and/or an observable galaxy-wide impact has yet to occur.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001696
       
  • The physical properties and impact of AGN outflows from high to low
           redshift

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      Authors: Venturi; Giacomo, Marconi, Alessandro
      Pages: 212 - 220
      Abstract: Feedback from active galactic nuclei (AGN) on their host galaxies, in the form of gas outflows capable of quenching star formation, is considered a major player in galaxy evolution. However, clear observational evidence of such major impact is still missing; uncertainties in measuring outflow properties might be partly responsible because of their critical role in comparisons with models and in constraining the impact of outflows on galaxies. Here we briefly review the challenges in measuring outflow physical properties and present an overview of outflow studies from high to low redshift. Finally, we present highlights from our MAGNUM survey of nearby AGN with VLT/MUSE, where the high intrinsic spatial resolution (down to ˜ 10 pc) allows us to accurately measure the physical and kinematic properties of ionised gas outflows.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002203
       
  • Kiloparsec-scale jet-driven feedback in AGN probed by highly ionized gas:
           A MUSE/VLT perspective

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      Authors: Rodríguez-Ardila; A., Fonseca-Faria, M. A.
      Pages: 221 - 225
      Abstract: We employ optical spectroscopy from the Multi Unit Spectroscopic Explorer (MUSE) combined with X-ray and radio data to study the highly-ionized gas (HIG) phase of the feedback in a sample of five local nearby Active Galactic Nuclei (AGN). Thanks to the superb field of view and sensitivity of MUSE, we found that the HIG, traced by the coronal line [Fe vii] λ6089, extends to scales not seen before, from 700 pc in Circinus and up to ∼2 kpc in NGC 5728 and NGC 3393. The gas morphology is complex, following closely the radio jet and the X-ray emission. Emission line ratios suggest gas excitation by shocks produced by the passage of the radio jet. This scenario is further supported by the physical conditions derived for the HIG, stressing the importance of the mechanical feedback in AGN with low-power radio jets.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002215
       
  • Ionized outflows in local luminous AGN: Density and outflow rate

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      Authors: Davies; R., Baron, D., Shimizu, T., Netzer, H.
      Pages: 226 - 231
      Abstract: We use the LLAMA survey to study the density and outflow rate of ionized gas in a complete volume limited sample of local (
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002276
       
  • Outflows & Feedback from Extremely Red Quasars

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      Authors: Hamann; Fred, Perrotta, Serena, Zakamska, Nadia
      Pages: 232 - 237
      Abstract: Feedback from accreting supermassive black holes is often invoked in galaxy evolution models to inhibit star formation, truncate galaxy growth, and establish the observed black-hole/bulge mass correlation. We are studying outflows and feedback in a unique sample of extremely red quasars (ERQs) during the peak epoch of galaxy formation (at redshifts 2.3 < z < 3.4). We identified ERQs in the Sloan Digital Sky Survey III (SDSS-III) Baryon Oscillation Spectroscopic Survey (BOSS) quasar catalog based on their extremely red i–W3 colors, but we find that ERQs typically have a suite of other extreme properties including 1) a high incidence of blueshifted broad absorption lines, 2) broad emission lines with unusually large rest equivalent widths (REWs), peculiar “wingless” profiles, and frequent large blueshifts (reaching ˜8740 km s-1), and 3) characteristically very broad and blueshifted [OIII] 4959,5007Å lines that trace ionized outflows at speeds up to ˜6700 km s-1. We propose that these ERQs represent a young quasar population with powerful outflows on the precipice of causing important disruptive feedback effects in their host galaxies.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320004330
       
  • Feeding and feedback from little monsters: AGN in dwarf galaxies

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      Authors: Mezcua; Mar
      Pages: 238 - 242
      Abstract: Detecting the seed black holes from which quasars formed is extremely challenging; however, those seeds that did not grow into supermassive should be found as intermediate-mass black holes (IMBHs) of 100 – 105 M⊙ in local dwarf galaxies. The use of deep multiwavelength surveys has revealed that a population of actively accreting IMBHs (low-mass AGN) exists in dwarf galaxies at least out to z ˜3. The black hole occupation fraction of these galaxies suggests that the early Universe seed black holes formed from direct collapse of gas, which is reinforced by the possible flattening of the black hole-galaxy scaling relations at the low-mass end. This scenario is however challenged by the finding that AGN feedback can have a strong impact on dwarf galaxies, which implies that low-mass AGN in dwarf galaxies might not be the untouched relics of the early seed black holes. This has important implications for seed black hole formation models.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002240
       
  • Taking snapshots of the jet-ISM interplay with ALMA

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      Authors: Morganti; Raffaella, Oosterloo, Tom, Tadhunter, Clive N.
      Pages: 243 - 248
      Abstract: We present an update of our ongoing project to characterise the impact of radio jets on the interstellar medium (ISM). This is done by tracing the distribution, kinematics and excitation of the molecular gas at high spatial resolution using ALMA. The radio active galactic nuclei (AGN) studied are in the interesting phase of having a recently born radio jet. In this stage, the plasma jets can have the largest impact on the ISM, as also predicted by state-of-the-art simulations. The two targets we present have quite different ages, allowing us to get snapshots of the effects of radio jets as they grow and evolve. Interestingly, both also host powerful quasar emission, making them ideal for studying the full impact of AGN. The largest mass outflow rate of molecular gas is found in a radio galaxy () hosting a newly born radio jet still in the early phase of emerging from an obscuring cocoon of gas and dust. Although the molecular mass outflow rate is high (few hundred), the outflow is limited to the inner few hundred pc region. In a second object (), the jet is larger (a few kpc) and is in a more advanced evolutionary phase. In this object, the distribution of the molecular gas is reminiscent of what is seen, on larger scales, in cool-core clusters hosting radio galaxies. Interestingly, gas deviating from quiescent kinematics (possibly indicating an outflow) is not very prominent, limited only to the very inner region, and has a low mass outflow rate. Instead, on kpc scales, the radio lobes appear associated with depressions in the distribution of the molecular gas. This suggests that the lobes have broken out from the dense nuclear region. However, the AGN does not appear to be able, at present, to stop the star formation observed in this galaxy. These results support the idea that the effects of the radio source start in the very first phases by producing outflows which, however, tend to be limited to the kpc region. After that, the effects turn into producing large-scale bubbles which could, in the long term, prevent the surrounding gas from cooling. Thus, our results provide a way to characterise the effect of radio jets in different phases of their evolution and in different environments, bridging the studies done for radio galaxies in clusters.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001775
       
  • Nuclear ionised outflows in a sample of 30 local galaxies

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      Authors: Ruschel-Dutra; D., Storchi-Bergmann, T., Schnorr-Müller, A.
      Pages: 249 - 254
      Abstract: Understanding active galactic nuclei (AGN) feedback is essential for building a coherent picture of the evolution of the super massive black hole and its host galaxy. To that end we have analysed the inner kiloparsec of a sample of 30 local AGN with spatially resolved optical spectroscopy. In this talk I will review the analysis of the ionised gas for the galaxies in our sample, including kinematical maps, emission line ratios and fluxes. The W80 kinematical index is used to trace outflows, and also to provide an estimate for the outflowing velocity. Electron densities, derived from the [S II] ΛΛ6716, 6731Å lines, along with Hα luminosities and the sizes of the outflowing regions are employed in estimates of the outflowing gas mass. We find a median mass outflow rate of Ṁ = 0.3 M⊙ yr-1 and median outflow power of log [P/(erg s-1)] = 40.4.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002446
       
  • Stellar population synthesis of jellyfish galaxies

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      Authors: Azevedo; Gabriel M., Chies Santos, Ana L., Riffel, Rogério, Lassen, Augusto, Trevisan, Marina, Mallmann, Nícolas, Oliveira, Fernanda, Gomes, Jean
      Pages: 255 - 256
      Abstract: Jellyfish are the most extreme cases of galaxies undergoing ram-pressure stripping. In order to analyse the stellar populations distribution along these galaxies, we have performed stellar population synthesis in data cubes of jellyfish from the GASP programme, using both Starlight and FADO codes.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320004056
       
  • Searching for Ultra-diffuse galaxies in the low-density environment around
           NGC 3115

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      Authors: Canossa-Gosteinski; Marco, Chies-Santos, Ana L., Furlanetto, Cristina, Freitas, Rodrigo F., Schoenell, William
      Pages: 257 - 259
      Abstract: Ultra-diffuse galaxies (UDGs) are extremely low luminosity galaxies and some of them seem to have a lack of dark matter. Therefore, they can offer important clues to better understand galaxy formation and evolution. Little is known about UDGs in less dense environments, as most of the known UDGs have been found in very dense regions, in the outskirts of massive galaxies in galaxy clusters. In this work, we present the properties of UDGs candidates identified through visual inspection around the low-density environment of NGC 3115, the closest S0 galaxy from the Milky Way. We have measured the structural parameters of 41 UDGs candidates using images obtained with the Dark Energy Camera at the Blanco Telescope. Such structural parameters will be used to characterise and select the best UDG candidates, that will have their properties traced for future follow-up campaigns.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001957
       
  • Constraining general relativity at z ∼ 0.299 MUSE Kinematics of
           SDP.81

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      Authors: Carneiro; Carlos R. M., Furlanetto, Cristina, Chies-Santos, Ana L.
      Pages: 260 - 261
      Abstract: General Relativity has been successfully tested on small scales. However, precise tests on galactic and larger scales have only recently begun. Moreover, the majority of these tests on large scales are based on the measurements of Hubble constant (H0), which is currently under discussion. Collett et al. (2018) implemented a novel test combining lensing and dynamical mass measurements of a galaxy, which are connected by a γ parameter, and found γ=0.97±0.09, which is consistent with unity, as predicted by GR. We are carrying out this same technique with a second galaxy, SDP.81 at z=0.299, and present here our preliminary results.
      PubDate: 2021-03-29
      DOI: 10.1017/S174392132000191X
       
  • Ionized gas outflows in the interacting radio galaxy 4C +29.30

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      Authors: Couto; Guilherme S., Storchi-Bergmann, Thaisa, Siemiginowska, Aneta, Riffel, Rogemar A.
      Pages: 262 - 264
      Abstract: We investigate the ionized gas excitation and kinematics in the inner 4.3 × 6.2 kpc2 of the merger radio galaxy 4C +29.30. Using optical integral field spectroscopy with the Gemini North Telescope, we find signatures of gas outflows, including high blueshifts of up to ∼−650 km s−1 observed in a region ∼1″ south of the nucleus, which also presents high velocity dispersion (∼250 km s−1). A possible redshifted counterpart is observed north from the nucleus. We propose that these regions correspond to a bipolar outflow possibly due to the interaction of the radio jet with the ambient gas. We estimate a total ionized gas mass outflow rate of with a kinetic power of , which represents of the AGN bolometric luminosity. These values are higher than usually observed in nearby active galaxies and could imply a significant impact of the outflows on the evolution of the host galaxy.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002112
       
  • Gauging the effect of feedback from QSOs on their host galaxies

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      Authors: de Oliveira; Bruno Dall’Agnol, Storchi-Bergmann, Thaisa
      Pages: 265 - 266
      Abstract: Often associated with the regulation of star formation in galaxies, active galactic nuclei (AGN) play a fundamental role in the evolution of galaxies through their feedback effects. To investigate the impact of these effects, we analysed the optical emission-line properties of 8 type II AGNs with bolometric luminosities LBol> 1045 erg s−1, using integral field spectroscopy (IFS) observations with Gemini Multi-Object Spectrograph (GMOS). The gas kinematics was obtained by fitting Gaussian components to the profiles of the emission lines of the ionized gas. Using only the broadest component – that we associate with the gas in outflow – we calculated the mass outflow rate (Ṁout), finding values of up to 10 M⊙ yr−1. The outflow kinetic power (Ėout reaches maximum values between 1041 and 1043 erg s−1, which correspond to feedback efficiencies of ∼0.001−0.1 % of Lbol. These values are below that required to quench the star formation during the evolution of galaxies in simulations and analytical models. We also investigated the effect of uncertainties on the values of the physical quantities used in the calculations – such as the electron density – on the final values of Ṁout and Ėout.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320004275
       
  • Feedback from ionised gas outflows in the central kpc of nearby active
           galaxies

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      Authors: David; Edwin, Storchi-Bergmann, Thaisa
      Pages: 267 - 268
      Abstract: We use integral-field spectroscopy obtained with the Gemini instrument GMOS-IFU (Gemini Multi-Object Spectrograph Integral Field Unit) to map the gas distribution, excitation and kinematics in the central kpc of 11 nearby active galaxies. We use channel maps to quantify the ionised gas masses, mass outflow rates and powers of the outflows in order to gauge the feedback effect of these outflows on the host galaxies. We compare this method with others previously used to calculate the feedback power of such outflows.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320004305
       
  • HST observations of [O III] emission in nearby QSO2s: Physical properties
           of the outflows

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      Authors: Falcao; Anna Trindade, Kraemer, S. B., Fischer, T. C., Crenshaw, D. M., Revalski, M., Schmitt, H. R.
      Pages: 269 - 271
      Abstract: We used Space Telescope Imaging Spectrograph (STIS) long slit medium-resolution G430M and G750M spectra to analyze the extended [O III] λ5007 emission in a sample of twelve QSO2s from Reyes et al. (2008). The purpose of the study was to determine the properties of the mass outflows and their role in AGN feedback. We measured fluxes and velocities as functions of deprojected radial distances. Using photoionization models and ionizing luminosities derived from [O III], we were able to estimate the densities for the emission-line gas. From these results, we derived masses, mass outflow rates, kinetic energies and kinetic luminosity rates as a function of radial distance for each of the targets. Masses are several times 103 - 107 solar masses, which are comparable to values determined from a recent photoionization study of Mrk 34 (Revalski). Additionally, we are studying the possible role of X-ray winds in these QSO2s.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320004196
       
  • The two-phase gas outflow in the Circinus Galaxy

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      Authors: Fonseca-Faria; M. A., Rodríguez-Ardila, A.
      Pages: 272 - 273
      Abstract: We employ Multi Unit Spectroscopic Explorer (MUSE) data to study the ionized and very ionized gas phase of the feedback in Circinus, the closest Seyfert 2 galaxy. The analysis of the nebular emission allowed us to detect a remarkable high-ionization gas outflow, out of the galaxy plane, traced by the coronal lines [Fe viii] 6089Å and [Fe x] 6374Å, extending up to 700 parsecs north-west from the nucleus. The gas kinematics reveal expanding gas shells with velocities of a few hundred km s-1, spatially coincident with prominent hard X-ray emission detected by Chandra. Density and temperature sensitive line ratios show that the extended high-ionization gas is characterized by a temperature of up to 18000 K and a gas density of ne> 102 cm−3. We propose two scenarios consistent with the observations to explain the high-ionization component of the outflow: an active galactic nuclei (AGN) ejection that took place ⁓105 yr ago or local gas excitation by shocks produced by the passage of a radio jet.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002082
       
  • Outflow signatures in Gemini GMOS-IFU observations of 5 nearby Seyfert 2
           galaxies

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      Authors: Freitas; Izabel C., Riffel, Rogemar A., Storchi-Bergmann, Thaisa
      Pages: 274 - 276
      Abstract: We use Gemini Multi-Object Spectrograph (GMOS) Integral Field Unit (IFU) observations of a sample of 5 bright nearby Seyfert galaxies to map their emission-line flux distributions and kinematics at a spatial resolution ranging from 110 to 280 pc. For all galaxies, the gas kinematics show two components: a rotation and an outflow component.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001854
       
  • The role of internal feedback in the evolution of the dwarf spheroidal
           galaxy Leo II

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      Authors: Hazenfratz; Roberto, Lanfranchi, Gustavo A., Caproni, Anderson
      Pages: 278 - 279
      Abstract: This work aims to explore the different processes of formation and evolution of dwarf spheroidal galaxies in the Local Group analyzing internal and external feedbacks, taking Leo II as a model of parametrization due to its adequate large distance to the Milky Way, in order to minimize potential external effects. We present a discussion of the first results regarding the processes of formation and galactic evolution from the gas hydrodynamics. Combined with previous studies for other similar systems, such results have the potential to establish strong links for the elaboration of a consistent and coherent scenario of formation and evolution of the dwarf spheroidal galaxies in the Local Group.
      PubDate: 2021-03-29
      DOI: 10.1017/S174392132000229X
       
  • Effects of supernovae feedback and black hole outflows in the evolution of
           Dwarf Spheroidal Galaxies

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      Authors: Lanfranchi; Gustavo Amaral, Caproni, Anderson, Soares, Jennifer F., de Oliveira, Larissa S.
      Pages: 280 - 282
      Abstract: The gas evolution of a typical Dwarf Spheroidal Galaxy is investigated by means of 3D hydrodynamic simulations, taking into account the feedback of type II and Ia supernovae, the outflow of an Intermediate Massive Black Hole (IMBH) and a static cored dark matter potential. When the IMBH’s outflow is simulated in an homogeneous medium a jet structure is created and a small fraction of the gas is pushed away from the galaxy. No jet structure can be seen, however, when the medium is disturbed by supernovae, but gas is still pushed away. In this case, the main driver of the gas removal are the supernovae. The interplay between the stellar feedback and the IMBH’s outflow should be taken into account.
      PubDate: 2021-03-29
      DOI: 10.1017/S174392132000215X
       
  • On the path toward a universal outflow mechanism in light of NGC 4151 and
           NGC 1068

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      Authors: May; D., Steiner, J. E., Menezes, R. B.
      Pages: 283 - 284
      Abstract: We use near-infrared Integral Field Unit (IFU) data to analyze the galaxies NGC 4151 and NGC 1068, which have very different Eddington ratios - ˜50 times lower for NGC 4151. Together with a detailed data cube treatment methodology, we reveal remarkable similarities between both AGN, such as the detection of the walls of an “hourglass” structure for the low-velocity [Fe ii] emission with the high-velocity emission within this hourglass; a molecular outflow - detected for the first time in NGC 4151; and the fragmentation of an expanding molecular bubble into bullets of ionized gas. Such observations suggest that NGC 4151 could represent a less powerful and more compact version of the outflow seen in NGC 1068, suggesting a universal feedback mechanism acting in quite different AGN.
      PubDate: 2021-03-29
      DOI: 10.1017/S174392132000201X
       
  • Identifying the extent of AGN outflows using spatially resolved gas
           kinematics

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      Authors: Meena; Beena, Crenshaw, D. M., Fischer, T. C., Schmitt, Henrique R., Revalski, M., Polack, G. E.
      Pages: 285 - 287
      Abstract: We present spatially resolved kinematics of ionized gas in the narrow-line region (NLR) and extended narrow-line region (ENLR) in a sample of nearby active galaxies. Utilizing long-slit spectroscopy from Apache Point Observatory (APO)13s ARC 3.5 m Telescope and Hubble Space Telescope (HST) we analyzed the strong λ5007 Å [O III] emission line profiles and mapped the radial velocity distribution of gas at increasing radii from the center. We identified the extents of Active Galactic Nuclei (AGN) driven outflows in our sample and determined the distances at which the observed gas kinematics is being dominated by the rotation of the host galaxy. We also measured the effectiveness of radiative driving of the ionized gas using mass distribution profiles calculated with two-dimensional modeling of surface brightness profiles in our targets. Finally, we compared our kinematic results of the outflow sizes with the maximum distances at which the gas is being radiatively driven to investigate whether these outflows are capable of disrupting or evacuating the star-forming gas at these distances.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002185
       
  • Mapping the inner kpc of the interacting Seyfert galaxy NGC 2992: Stellar
           populations and gas kinematics

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      Authors: Guolo-Pereira; Muryel, Ruschel-Dutra, Daniel
      Pages: 288 - 290
      Abstract: We present Gemini Multi-Object Spectrograph Integral Field Unit (GMOS-IFU) observations of the inner 1.1 kpc of the interacting Seyfert galaxy NGC 2992. From full spectral synthesis we found that the stellar population is mainly (up to 80 per cent of the total light) composed by an old (t ≥ 1.4 Gyr) metal-rich (Z ≥ 2.0) populations with a smaller but considerable contribution (up to 30 per cent) from young (t ≤ 100 Myr) metal-poor (Z ≥ 1.0) populations. The gas kinematics presents two main components: one from gas in orbit in the galaxy disk and an outflow with mass outflow rate of ˜2 Mʘ yr–1 and a kinematic power of ˜ 2 × 1040 erg s–1.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002288
       
  • A MUSE study of NGC 7469: Spatially resolved star-formation and AGN-driven
           outflows

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      Authors: Robleto-Orús; A. C., Torres-Papaqui, J. P., Longinotti, A. L., Ortega-Minakata, R. A., Sánchez, S. F., Ascasibar, Y., Bellocchi, E., Galbany, L., Chow-Martínez, M., Trejo-Alonso, J. J., Morales-Vargas, A., Romero-Cruz, F. J., Cutiva-Alvarez, K. A., Coziol, R.
      Pages: 291 - 294
      Abstract: NGC 7469 is a well-known type 1 AGN with a cirumnuclear star formation ring. It has previous detections of X-rays warm absorbers and an infrared biconical outflow. We analysed archival MUSE/VLT observations of this galaxy in order to look for an optical counterpart of these outflows. We report spatially resolved winds in the [O III] λ5007 emission line in two regimes: a high velocity regime possibly associated with the AGN and a slower one associated with the massive star formation of the ring. This slower regime is also detected with Hβ.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001593
       
  • Nature of inflows and outflows in AGNs

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      Authors: Wada; Keiichi, Kudoh, Yuki, Yutani, Naomichi, Kawakatu, Nozomu
      Pages: 297 - 306
      Abstract: Despite many theoretical studies and observations, we still do not fully understand the feeding mechanism in AGNs even in nearby galaxies, and how feedback from AGNs affects the gas dynamics itself in the galactic central regions. In this article, we summarize our recent theoretical studies and preliminary results in terms of the mass inflow and outflows on sub-parsec to 100 parsecs scales around AGNs. We introduce different studies: 1) How do galaxy-galaxy mergers trigger AGN activity and obscuration', 2) How do the radiative feedback affect formation of outflows and obscuration of the nucleus' and 3) How does the AGN plus starburst feedback contribute to the obscuration'
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320004251
       
  • Feeding and feedback in nuclei of galaxies

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      Authors: Audibert; Anelise, Combes, Françoise, García-Burillo, Santiago, Dasyra, Kalliopi
      Pages: 307 - 311
      Abstract: Our aim is to explore the close environment of Active Galactic Nuclei (AGN) and its connection to the host galaxy through the morphology and dynamics of the cold gas inside the central kpc in nearby AGN. We report Atacama Large Millimeter/submillimeter Array (ALMA) observations of AGN feeding and feedback caught in action in NGC613 and NGC1808 at high resolution (few pc), part of the NUclei of GAlaxies (NUGA) project. We detected trailing spirals inside the central 100 pc, efficiently driving the molecular gas into the SMBH, and molecular outflows driven by the AGN. We present preliminary results of the impact of massive winds induced by radio jets on galaxy evolution, based on observations of radio galaxies from the ALMA Radio-source Catalogue.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002239
       
  • Circum-nuclear molecular disks: Role in AGN fueling and feedback

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      Authors: Combes; Francoise
      Pages: 312 - 317
      Abstract: Gas fueling AGN (Active Galaxy Nuclei) is now traceable at high-resolution with ALMA (Atacama Large Millimeter Array) and NOEMA (NOrthern Extended Millimeter Array). Dynamical mechanisms are essential to exchange angular momentum and drive the gas to the super-massive black hole. While at 100pc scale, the gas is sometimes stalled in nuclear rings, recent observations reaching 10pc scale (50mas), may bring smoking gun evidence of fueling, within a randomly oriented nuclear gas disk. AGN feedback is also observed, in the form of narrow and collimated molecular outflows, which point towards the radio mode, or entrainment by a radio jet. Precession has been observed in a molecular outflow, indicating the precession of the radio jet. One of the best candidates for precession is the Bardeen-Petterson effect at small scale, which exerts a torque on the accreting material, and produces an extended disk warp. The misalignment between the inner and large-scale disk, enhances the coupling of the AGN feedback, since the jet sweeps a large part of the molecular disk.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001544
       
  • Observations of AGN feeding and feedback on Nuclear, Galactic, and
           Extragalactic Scales

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      Authors: Crenshaw; D. Michael, Gnilka, C. L., Fischer, T. C., Revalski, M., Meena, B., Martinez, F., Polack, G E., Machuca, C., Dashtamirova, D., Kraemer, S. B., Schmitt, H. R., Riffel, R. A., Storchi-Bergmann, T.
      Pages: 318 - 322
      Abstract: We investigate the processes of active galactic nuclei (AGN) feeding and feedback in the narrow line regions (NLRs) and host galaxies of nearby AGN through spatially resolved spectroscopy with the Gemini Near-Infrared Integral Field Spectrograph (NIFS) and the Hubble Space Telescope’s Space Telescope Imaging Spectrograph (STIS). We examine the connection between nuclear and galactic inflows and outflows by adding long-slit spectra of the host galaxies from Apache Point Observatory. We demonstrate that nearby AGN can be fueled by a variety of mechanisms. We find that the NLR kinematics can often be explained by in situ ionization and radiative acceleration of ambient gas, often in the form of dusty molecular spirals that may be the fueling flow to the AGN.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001623
       
  • Interstellar medium properties and feedback in local AGN with the MAGNUM
           survey

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      Authors: Mingozzi; M., Cresci, G., Venturi, G., Marconi, A., Mannucci, F.
      Pages: 323 - 328
      Abstract: We investigated the interstellar medium (ISM) properties in the central regions of nearby Seyfert galaxies characterised by prominent conical or bi-conical outflows belonging to the MAGNUM survey by exploiting the unprecedented sensitivity, spatial and spectral coverage of the integral field spectrograph MUSE at the Very Large Telescope. We developed a novel approach based on the gas and stars kinematics to disentangle high-velocity gas in the outflow from gas in the disc to spatially track the differences in their ISM properties. This allowed us to reveal the presence of an ionisation structure within the extended outflows that can be interpreted with different photoionisation and shock conditions, and to trace tentative evidence of outflow-induced star formation (“positive” feedback) in a galaxy of the sample, Centaurus A.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002422
       
  • The first AI simulation of a black hole

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      Authors: Nemmen; Rodrigo, Duarte, Roberta, Navarro, João P.
      Pages: 329 - 333
      Abstract: We report the results from our ongoing pilot investigation of the use of deep learning techniques for forecasting the state of turbulent flows onto black holes. Deep neural networks seem to learn well black hole accretion physics and evolve the accretion flow orders of magnitude faster than traditional numerical solvers, while maintaining a reasonable accuracy for a long time.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320003981
       
  • Gas flows in a changing-look AGN

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      Authors: Raimundo; Sandra I.
      Pages: 334 - 338
      Abstract: The galaxy Mrk 590 is one of the few known ‘changing-look’ Active Galactic Nuclei (AGN) to have transitioned between states twice, having just increased its flux after a period of ˜10 years of low activity. In addition to the increase in flux, the optical broad emission lines have reappeared but show a different profile than what was observed before they disappeared. The gas motions in the host galaxy of this changing-look AGN show outflows and dynamical structures able to drive gas to the nucleus, suggesting an interplay between inflow and outflow in the centre of the galaxy.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001672
       
  • The relation between the environment and nuclear activity in nearby QSOs:
           Defining a control sample

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      Authors: Araujo; Bruna L. C., Storchi-Bergmann, Thaisa, Rembold, Sandro B.
      Pages: 339 - 341
      Abstract: In this study, we aim to investigate the relation between nuclear activity and the environment for luminous (L[O III]>7.63 × 1041 erg s–1) Active Galactic Nuclei (AGN) - that, at these luminosities are classified as quasi-stellar objects (QSOs) - using a sample of 436 type 2 QSOs. Recent studies suggest that there is an excess of interacting hosts in luminous AGN, indicating that interactions trigger the nuclear activity. In order to examine this, it is necessary to select a control sample of non-active galaxies, matched to the active ones by the properties of the host galaxies, such as distance and stellar mass. We present here the results of the search for such a control sample.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002094
       
  • The relation between dust amount and galaxy mass across the cosmic time

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      Authors: Barbosa-Santos; J. H., Lima Neto, G. B.
      Pages: 342 - 344
      Abstract: Dust Obscured Galaxies (DOGs) are observed as far as the reionization epoch. Their cosmic density peaks together with the star formation rate. DOGs also rule the star formation in high stellar mass galaxies. In this work we used a chemodynamical model to evolve the amount of dust in galaxies. We ran forty models varying initial mass and both dust formation efficiency and dust production. We find that for high star formation rate systems the accretion dominates the dust evolution and it explains high-z DOGs. Low star formation rate systems are better suited to investigate dust production. Also, we find that a MDust/MGas versus MDust/M* diagram is a good tracer of galaxy evolution.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001763
       
  • Kinematics of the parsec-scale jet of the blazar AO 0235+164

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      Authors: Silva Junior; Flávio Benevenuto da, Caproni, Anderson
      Pages: 345 - 346
      Abstract: Radio interferometric maps of the blazar AO 0235+164 show the existence of a stationary core, and a compact jet composed of multiple receding components. In this work, we determined the structural characteristics of these jet components (core-component distance, position angle, flux density, etc.) using the statistical method for global optimization Cross-Entropy (CE). The images we analyzed were extracted from public databases, totaling 41 images at 15 GHz and 128 images at 43 GHz. Using criteria such as the value of the CE merit function, and mean residuals, we determined the optimum number of components in each map analyzed in this work. We found that jet components are distributed across all four quadrants on the plane of the sky, indicating a possible non-fixed jet orientation during the monitoring interval. The time evolution of the equatorial coordinates of the jet components were used to determine their respective speeds, ejection epochs, and mean position angles on the plane of the sky. We have identified more than 20 components in the jet of AO 0235+164, with their apparent speeds ranging roughly from 2c to 40c, and distributed across all four quadrants on the plane of the sky. From the kinematics of these jet components we could derive a lower limit of about 39 for its bulk jet Lorentz factor and an upper limit of approximately 42 degrees for its jet viewing angle.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001982
       
  • Multiwavelength analysis of OH Megamaser galaxies: The case of
           IRAS11506-3851

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      Authors: Hekatelyne; Carpes P., Storchi-Bergmann, Thaisa
      Pages: 347 - 349
      Abstract: We present Multi-Object Spectrograph (GMOS) Integral Field Unit (IFU), Hubble Space Telescope (HST) and Very Large Array (VLA) observations of the inner kpc of the OH Megamaser galaxy IRAS 11506-3851. In this work we discuss the kinematics and excitation of the gas as well as its radio emission. The HST images reveal an isolated spiral galaxy and the combination with the GMOS-IFU flux distributions allowed us to identify a partial ring of star-forming regions surrounding the nucleus with a radius of ≍500 pc. The emission-line ratios and excitation map reveal that the region inside the ring present mixed/transition excitation between those of Starbursts and Active Galactic Nuclei (AGN), while regions along the ring are excited by Starbursts. We suggest that we are probing a buried or fading AGN that could be both exciting the gas and originating an outflow.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320004317
       
  • Galactic nuclear off-centerings: the innermost accretion mechanism'

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      Authors: Gaspar; Gaia, Díaz, Rubén, Mast, Damían, Agüero, María P.
      Pages: 350 - 351
      Abstract: In the current scenario of galaxy evolution, supermassive black holes (SMBH) are present in almost all galaxies. To trigger nuclear activity, large amounts of material have to fall from kpc to pc and even smaller scales. Hence, an efficient angular momentum removal mechanism is needed. A growing black hole could still not be fixed in the gravitational potential well of the galaxy. This can be observed as a break in the symmetry between the global structure of the galaxy and the central source and could be part of the mechanism that drives material from the last hundred parsecs onto accretion in the SMBH. We present spatial profile decomposition of 16 galaxies observed with GNIRS (Gemini North) in the Klong band. We have been able to measure off-centerings in 3 of 16 galaxies. We found a possible correlation between the presence of an off-centering and the SMBH mass.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001799
       
  • Modelling the silicate emission features in type 1 AGNs: Dusty torus and
           disk+outflow models

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      Authors: Martínez-Paredes; M., Aretxaga, I.
      Pages: 352 - 354
      Abstract: We investigated how the most common dusty torus models reproduce both the 10 and 18μm silicate emission features observed in the nuclear infrared (IR) Spitzer spectrum of type 1 active galactic nuclei (AGN). We use a sample of type 1 AGN for which the Spitzer spectrum is mostly dominated by the emission of the AGN (>80%), and the 10μm silicate emission feature is prominent (1σSi10μm> 0.28). The models are the smooth dusty torus models from Fritz et al., the clumpy dusty torus models from Nenkova et al. and Hoenig et al., the two-phase media torus model from Stalevski et al., and the disk+outflow model from Hoenig et al. These models differ by assuming either different geometry or dust composition. We found that in general, all models have difficulties reproducing the shape and peak of the silicate emission features, but the disk+outflow model is the best reproducing the AGN-dominated Spitzer spectrum.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001635
       
  • NIR–IFU observations of the merger remnant NGC 34

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      Authors: Motter; Juliana C., Riffel, Rogério, Ricci, Tiago V., Dametto, Natacha Z., Dahmer-Hahn, Luis G., Diniz, Marlon R., Riffel, Rogemar A., Pastoriza, Miriani G., Rodríguez-Ardila, Alberto, Storchi-Bergmann, Thaísa, Ruschel-Dutra, Daniel
      Pages: 355 - 356
      Abstract: Understanding the interplay between the phenomena of active galactic nuclei (AGN) and starbursts remains an open issue in studies of galaxy evolution. The galaxy NGC 34 is the remnant of the merger of two former gas-rich disc galaxies and it also hosts a strong nuclear starburst. In this work, we map the ionized and molecular gas present in the nuclear regions of the galaxy NGC 34 using adaptive optics (AO) assisted near infrared (NIR) integral field unity (IFU) observations. Our main goals are to better constrain the energy source of this object and to use NGC 34 as a laboratory to probe the AGN-starburst connection in the context of galaxy evolution and AGN feeding and feedback processes.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002033
       
  • Optical properties of CSS/GPS sources

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      Authors: Nascimento; Raquel S., Rodríguez-Ardila, Alberto, Faria, Marcos F., Marinello, Murilo, Dahmer-Hahn, Luis G.
      Pages: 357 - 359
      Abstract: In this work, we study the optical properties of 58 CSS/GPS radio sources selected from the literature in order to determine the impact of the radio-jet in the circumnuclear environment of these objects. We obtained optical spectra for all sources from SDSS-DR12 and performed a stellar population synthesis using the Starlight code. Our results indicate that the sample is dominated by intermediate to old stellar populations and there is no strong correlation between optical and radio properties of these sources.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001714
       
  • The excitation mechanisms of X-ray oxygen emission-lines

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      Authors: Reynaldi; Victoria, Guainazzi, Matteo, Bianchi, Stefano, Andruchow, Ileana, García, Federico, López, Iván, Salerno, Nicolás
      Pages: 360 - 361
      Abstract: We present the Catalogue of High REsolution Spectra of Obscured Sources (CHRESOS) from the XMM-Newton Science Archive. It comprises soft X-ray emission-lines from C to Si and the Fe 3C and Fe 3G L-shell transitions. Here, we concentrate on the oxygen emission-lines O VII(f) and O VIII Lyα to shed light onto the physical processes with which their formation can be related to: active galactic nucleus vs. star-forming regions. We are analysing the relationships between the oxygen lines and the luminosities of: [OIII]λ5007, [OIV]25.89μm, MIR-12μm, FIR-60μm, FIR-100μm, and hard X-rays continuum bands.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002057
       
  • The birth of an AGN: NGC 4111

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      Authors: Roier; Gabriel R. H., Storchi-Bergmann, Thaisa
      Pages: 362 - 363
      Abstract: We have used near-infrared and optical Integral Field Spectroscopy along with optical images to study the inner 100 pc of NGC 4111 in a project to investigate the stellar and gas kinematics in the surroundings of Supermassive Black Holes in nearby galaxies. We have compared the inner stellar and gas kinematics with data of the outer regions of the galaxy. We found larger scale hot ionized gas and warm molecular gas within the inner 100 pc that is in counter-rotation relative to the stellar kinematics, a sign of inflowing material that is probably triggering an Active Galactic Nucleus. This is supported by the nuclear X-ray emission which is heating the molecular gas and causing it to emit. The presence of large amounts of dust in a polar ring suggests that this is a fairly recent event probably due to the capture of a dwarf galaxy.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001556
       
  • Feeding and feedback in the nucleus of NGC 613

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      Authors: da Silva; Patrícia, Steiner, J. E., Menezes, R. B.
      Pages: 364 - 365
      Abstract: Active Galactic Nuclei (AGN) are objects in which a supermassive black hole is fed by gas and, as this generates energy, can ionise the environment and interact with it by jets and winds. This work is focused on the processes of feeding and feedback in the nucleus of NGC 613. This object is a case in which both phenomena can be studied in some detail. The kinematics and morphology of the molecular gas trace the feeding process while the ionization cone, seen in [O iii]λ5007 and soft X-rays, as well as the radio jet and wind/outflows are associated with feedback processes. In addition, we see 10 HII regions, associated with nuclear and circumnuclear young stellar populations, dominant in the optical, that makes the analysis complicated, though more interesting. For all these phenomena, NGC 613 nucleus is a vibrant example of the interplay between the AGN and the host galaxy.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001490
       
  • Molecular and ionised gas kinematics in a sample of nearby active galaxies

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      Authors: Bianchin; Marina, Riffel, Rogemar A., Storchi-Bergmann, Thaisa, Riffel, Rogério, Schonell, Astor J.
      Pages: 366 - 368
      Abstract: We used Gemini NIFS integral field spectroscopy to analyse the molecular and ionised gas kinematics of six nearby (z ⩽ 0.015) Seyfert galaxies with a spatial coverage of 0.1 – 0.6 kpc2. By fitting the emission-line profiles using multiple Gaussian components we determined that the ionised and hot molecular gas kinematics are dominated by gas outflows and rotation, respectively, even though three objects also present molecular outflows.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001520
       
  • The importance of the diffuse ionized gas for interpreting galaxy spectra

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      Authors: Vale Asari; Natalia, Stasińska, Grażyna
      Pages: 371 - 380
      Abstract: Diffuse ionized gas (DIG) in galaxies can be found in early-type galaxies, in bulges of late-type galaxies, in the interarm regions of galaxy disks, and outside the plane of such disks. The emission-line spectrum of the DIG can be confused with that of a weakly active galactic nucleus. It can also bias the inference of chemical abundances and star formation rates in star forming galaxies. We discuss how one can detect and feasibly correct for the DIG contribution in galaxy spectra.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002124
       
  • Reconstructing the mass accretion histories of nearby red nuggets with
           their globular cluster systems

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      Authors: Beasley; Michael A., Leaman, Ryan, Trujillo, Ignacio, Montes, Mireia, Vazdekis, Alejandro, Rusiñol, Núria Salvador, Eftekhari, Elham, Ferré-Mateu, Anna, Martn-Navarro, Ignacio
      Pages: 381 - 385
      Abstract: It is generally recognized that massive galaxies form through a combination of in-situ collapse and ex-situ accretion. The in-situ component forms early, where gas collapse and compaction leads to the formation of massive compact systems (blue and red “nuggets”) seen at z> 1. The subsequent accretion of satellites brings in ex-situ material, growing these nuggets in size and mass to appear as the massive early-type galaxies (ETGs) we see locally. Due to stochasticity in the accretion process, in a few rare cases a red nugget will evolve to the present day having undergone little ex-situ mass accretion. The resulting massive, compact and ancient objects have been termed “relic galaxies”. Detailed stellar population and kinematic analyses are required to characterise these systems. However, an additional crucial aspect lies in determining the fraction of ex-situ mass they have accreted since their formation. Globular cluster systems can be used to constrain this fraction, since the oldest and most metal-poor globular clusters in massive galaxies are primarily an accreted, ex-situ population. Models for the formation of relic galaxies and their globular cluster systems suggest that, due to their early compaction and limited accretion of dark-matter dominated satellites, relic galaxies should have characteristically low dark-matter mass fractions compared to ETGs of the same stellar mass.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320004020
       
  • Recovering the star formation history of galaxies through spectral
           fitting: Current challenges

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      Authors: Martins; Lucimara P.
      Pages: 386 - 390
      Abstract: With the exception of some nearby galaxies, we cannot resolve stars individually. To recover the galaxies star formation history (SFH), the challenge is to extract information from their integrated spectrum. A widely used tool is the full spectral fitting technique. This consists of combining simple stellar populations (SSPs) of different ages and metallicities to match the integrated spectrum. This technique works well for optical spectra, for metallicities near solar and chemical histories not much different from our Galaxy. For everything else there is room for improvement. With telescopes being able to explore further and further away, and beyond the optical, the improvement of this type of tool is crucial. SSPs use as ingredients isochrones, an initial mass function, and a library of stellar spectra. My focus are the stellar libraries, key ingredient for SSPs. Here I talk about the latest developments of stellar libraries, how they influence the SSPs and how to improve them.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001647
       
  • From global to local scales in galaxies

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      Authors: Sánchez; Sebastian F., Lopez Cobá, Carlos
      Pages: 391 - 395
      Abstract: We summarize here some of the results reviewed recently by Sanchez (2020) comprising the advances in the comprehension of galaxies in the nearby universe based on integral field spectroscopic galaxy surveys. In particular we explore the bimodal distribution of galaxies in terms of the properties of their ionized gas, showing the connection between the star-formation (quenching) process with the presence (absence) of molecular gas and the star-formation efficiency. We show two galaxy examples that illustrates the well known fact that ionization in galaxies (and the processes that produce it), does not happen monolitically at galactic scales. This highlight the importance to explore the spectroscopic properties of galaxies and the evolutionary processes unveiled by them at different spatial scales, from sub-kpc to galaxy wide.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001568
       
  • Radio galaxies with and without emission lines

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      Authors: Stasińska; Grażyna, Asari, Natalia Vale, Kozieł-Wierzbowska, Dorota
      Pages: 396 - 401
      Abstract: Using the recent ROGUE I catalogue of galaxies with radio cores (Kozie_l-Wierzbowska et al. 2020) and after selecting the objects which are truly radio active galactic nuclei, AGNs, (which more than doubles the samples available so far), we perform a thorough comparison of the properties of radio galaxies with and without optical emission lines (galaxies where the equivalent width of Hα is smaller than 3Å are placed in the last category). We do not find any strong dichotomy between the two classes as regards the radio luminosities or black hole masses. The same is true when using the common classification into high- and low-excitation radio galaxies (HERGs and LERGs respectively).
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001866
       
  • The DIVING3D Survey - Deep IFS View of Nuclei of Galaxies

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      Authors: Steiner; J. E., Menezes, R. B., Ricci, T. V., ,
      Pages: 402 - 406
      Abstract: The DIVING3D Survey (Deep Integral Field Spectrograph View of Nuclei of Galaxies) aims to observe, with high signal/noise and high spatial resolution, a statistically complete sample of southern galaxies brighter than B = 12.0 The main objectives of this survey are to study: 1) the nuclear emission line properties; 2) the circumnuclear emission line properties; 3) the central stellar kinematics and 4) the central stellar archaeology. Preliminary results of individual or small groups of galaxies have been published in 18 papers.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001817
       
  • Surface Brightness Fluctuations for constraining the chemical enrichment
           of massive galaxies

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      Authors: Vazdekis; A., Rodrguez-Beltrán, P., Cerviño, M., Montes, M., Martn-Navarro, I., Beasley, M. B.
      Pages: 407 - 412
      Abstract: Based on very deep photometry, Surface Brightness Fluctuations (SBF) have been traditionally used to determine galaxy distances. We have recently computed SBF spectra of stellar populations at moderately high resolution, which are fully based on empirical stars. We show that the SBF spectra provide an unprecedented potential for stellar population studies that, so far, have been tackled on the basis of the mean fluxes. We find that the SBFs are able to unveil metal-poor stellar components at the one percent level, which are not possible to disentangle with the standard analysis. As these metal-poor components correspond to the first stages of the chemical enrichment, the SBF analysis provides stringent constrains on the quenching epoch.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001702
       
  • Ionized gas kinematics and luminosity profiles of Low-z Lyman Alpha Blobs

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      Authors: Agüero; María P., Díaz, Rubén, Schirmer, Mischa
      Pages: 413 - 414
      Abstract: This work is focused on the characterization of the Seyfert-2 galaxies hosting very large, ultra-luminous narrow-line regions (NLRs) at redshifts z = 0.2−0.34. With a space density of 4.4 Gcp−3 at z ∼ 0.3, these “Low Redshift Lyman-α Blob” (LAB) host galaxies are amongst the rarest objects in the universe, and represent an exceptional and short-lived phenomenon in the life cycle of active galactic nuclei (AGNs). We present the study of GMOS spectra for 13 LAB galaxies covering the rest frame spectral range 3700–6700 Å. Predominantly, the [OIII]λ5007 emission line radial distribution is as widespread as that of the continuum one. The emission line profiles exhibit FWHM between 300–700 Km s−1. In 7 of 13 cases a broad kinematical component is detected with FWHM within the range 600–1100 Km s−1. The exceptionally high [OIII]λ5007 luminosity is responsible for very high equivalent width reaching 1500 Å at the nucleus.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001489
       
  • Alternative classification diagrams for AGN-starburst galaxies

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      Authors: Aydar; Catarina P., Steiner, J. E., Dors, Oli
      Pages: 415 - 417
      Abstract: The aim of diagnostic diagrams is to classify galactic nuclei according to their photoionizing source using emission-line ratios, differentiating starburst regions from active galactic nuclei (AGN). However, the three traditional diagnostic diagrams can sometimes be ambiguous with regard to a single object. The main goal of the present work is to propose alternative diagnostic diagrams by using distinct combinations of emission lines ratios. We present these diagrams using data from the Sloan Digital Sky Survey. With these new diagrams, it is possible to better distinguish the ionizing source in nuclei of galaxies and also to study the parameters that are relevant when considering both kinds of objects, starbursts and AGN.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001787
       
  • Unveiling the nuclear region of NGC 6868: Mapping the stellar population
           and ionized gas

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      Authors: Benedetti; João P. V., Riffel, Rogério, Ricci, Tiago V., Steiner, João E., Riffel, Rogemar A., Pastoriza, Miriani G., Ruschel-Dutra, Daniel, Motter, Juliana C.
      Pages: 418 - 420
      Abstract: We mapped the stellar population and emission gas properties in the nuclear region of NGC 6868 using datacubes extracted with Gemini Multi-Object Spectrograph (GMOS) in the Integral Field Unit (IFU) mode. To obtain the star-formation history of this galaxy we used the starlight code together with the new generation of MILES simple stellar population models. The stellar population dominating (95% in light fraction) the central region of NGC 6868 is old and metal rich (~10 Gyr, 2.2 Z⊙). We also derived the kinematics and emission line fluxes of ionized gas with the IFSCube package. A rotation disk is clearly detected in the nuclear region of the galaxy and no broad components were detected. Also, there is a region where the emission lines disappear almost completely, probably due to diffuse ionized gas component. Channel maps, diagnostic diagrams and stellar kinematics are still under analysis.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320001994
       
  • Recovering the origin of the lenticular galaxy NGC3115 using multi-band
           photometry

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      Authors: Buzzo; Maria Luísa, Cortesi, Arianna, Werle, Ariel, de Oliveira, Claudia Mendes
      Pages: 421 - 423
      Abstract: We perform simultaneous multi-band fitting, using the routine GALFITM, of the galaxy NGC3115, in order to recover the stellar populations of its main components (a bulge, a thin disc and a thick disc). We model 11 bands, from ultraviolet to infrared, in order to take into account the galaxy younger stellar population and the presence of the Active Galactic Nuclei (AGN). We find that the majority of the galaxy baryonic mass belongs to the thick disc, which is also the oldest galaxy component, consistent with results from the literature. Differently from previous works, we find that the bulge has the bluest colour and it is younger than the thick disc, either as a result of recent star formation activity, or AGN feedback, or white dwarf emission in an old stellar population. Finally, we propose that NGC3115 was formed either through a two-phase formation scenario, or via an outside-in quenching of an isolated spiral galaxy, whose thick disc had been heated-up via minor mergers with dwarf satellites.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320004202
       
  • Direct measures of chemical abundances from stacked spectra of
           star-forming galaxies: Implications for the mass–metallicity–star
           formation rate relation

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      Authors: Clerici; Slodkowski Katia, Vale Asari, Natalia
      Pages: 424 - 426
      Abstract: The stellar mass–star formation rate–metallicity relation provides clues on the chemical evolution of galaxies. We revisit this relation by measuring the gas-phase metallicity using the direct method. For metal-rich galaxies this is not straightforward, because auroral emission lines sensitive the electron temperature are lost in spectral noise. In order to increase the spectral signal-to-noise ratio and detect faint auroral lines, we stack the spectra of similar galaxies. This allows us to use the direct method to obtain consistent metallicity measurements.
      PubDate: 2021-03-29
      DOI: 10.1017/S174392132000188X
       
  • A panchromatic spatially resolved study of the inner 500 pc of NGC 1052

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      Authors: Dahmer-Hahn; Luis G., Riffel, Rogério, Ricci, Tiago V., Steiner, João E., Storchi-Bergmann, Thaisa, Riffel, Rogemar A., Menezes, Roberto B., Dametto, Natacha Z., Diniz, Marlon R., Motter, Juliana C., Ruschel-Dutra, Daniel
      Pages: 427 - 428
      Abstract: We analyzed the inner 320 × 535 pc2 of the elliptical galaxy NGC 1052 with integral field spectroscopy, both in the optical and in the near-infrared (NIR). The stellar population analysis revealed a dominance of old stellar populations from the optical data, and an intermediate-age ring from NIR data. When combining optical+NIR data, optical results were favoured. The emission-line analysis revealed five kinematic components, where two of them are unresolved and probably associated with the active galactic nucleus (AGN), one is associated with large-scale shocks, one with the radio jets, and the last could be explained by either a bipolar outflow, rotation in an eccentric disc or a combination of a disc and large-scale gas bubbles. Our results also indicate that the emission within the galaxy is caused by a combination of shocks and photoionization by the AGN.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002100
       
  • Hα plumes or arms associated with the nucleus of NGC 7020

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      Authors: Dottori; H., Díaz, R., Gimeno, G., Bianchi, A., Gaspar, G.
      Pages: 429 - 430
      Abstract: We imaged the galaxy NGC 7020 with Gemini and GMOS-S interference filters centered on the Hα emission line and nearby continuum in order to detect and quantify the HII regions. Among about 200 HII regions, we detected two Hα emitting plumes or arms emerging from the galactic nucleus which, together with the nuclear emission, might indicate a process of feedback from the central region.
      PubDate: 2021-03-29
      DOI: 10.1017/S1743921320002331
       
 
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