Subjects -> ASTRONOMY (Total: 94 journals)
Showing 1 - 46 of 46 Journals sorted alphabetically
Advances in Astronomy     Open Access   (Followers: 51)
Annual Review of Astronomy and Astrophysics     Full-text available via subscription   (Followers: 39)
Annual Review of Earth and Planetary Sciences     Full-text available via subscription   (Followers: 63)
Artificial Satellites     Open Access   (Followers: 23)
Astrobiology     Hybrid Journal   (Followers: 14)
Astronomical & Astrophysical Transactions: The Journal of the Eurasian Astronomical Society     Hybrid Journal   (Followers: 6)
Astronomical Journal     Full-text available via subscription   (Followers: 8)
Astronomical Review     Open Access   (Followers: 4)
Astronomische Nachrichten     Hybrid Journal   (Followers: 4)
Astronomy & Geophysics     Hybrid Journal   (Followers: 48)
Astronomy and Astrophysics     Full-text available via subscription   (Followers: 60)
Astronomy and Astrophysics     Open Access   (Followers: 32)
Astronomy and Computing     Hybrid Journal   (Followers: 2)
Astronomy Letters     Hybrid Journal   (Followers: 22)
Astronomy Reports     Hybrid Journal   (Followers: 15)
Astronomy Studies Development     Open Access   (Followers: 12)
Astroparticle Physics     Hybrid Journal   (Followers: 8)
Astrophysical Bulletin     Hybrid Journal   (Followers: 3)
Astrophysical Journal     Full-text available via subscription   (Followers: 19)
Astrophysical Journal Letters     Full-text available via subscription   (Followers: 14)
Astrophysical Journal Supplement Series     Full-text available via subscription   (Followers: 14)
Astrophysics     Hybrid Journal   (Followers: 29)
Astrophysics and Space Science     Hybrid Journal   (Followers: 46)
Astrophysics and Space Sciences Transactions (ASTRA)     Open Access   (Followers: 56)
Astropolitics: The International Journal of Space Politics & Policy     Hybrid Journal   (Followers: 12)
Celestial Mechanics and Dynamical Astronomy     Hybrid Journal   (Followers: 11)
Chinese Astronomy and Astrophysics     Full-text available via subscription   (Followers: 24)
Colloid Journal     Hybrid Journal   (Followers: 3)
Comptes Rendus Physique     Full-text available via subscription   (Followers: 2)
Computational Astrophysics and Cosmology     Open Access   (Followers: 3)
COSPAR Colloquia Series     Full-text available via subscription   (Followers: 11)
Earth, Moon, and Planets     Hybrid Journal   (Followers: 55)
Earth, Planets and Space     Open Access   (Followers: 74)
EAS Publications Series     Full-text available via subscription   (Followers: 8)
EPL Europhysics Letters     Partially Free   (Followers: 8)
Experimental Astronomy     Hybrid Journal   (Followers: 39)
Expert Opinion on Astronomy and Astrophysics     Open Access   (Followers: 7)
Extreme Life, Biospeology & Astrobiology - International Journal of the Bioflux Society     Full-text available via subscription   (Followers: 6)
Few-Body Systems     Hybrid Journal   (Followers: 1)
Foundations of Physics     Hybrid Journal   (Followers: 41)
Frontiers in Astronomy and Space Sciences     Open Access   (Followers: 12)
Galaxies     Open Access   (Followers: 6)
Globe, The     Full-text available via subscription   (Followers: 4)
Gravitation and Cosmology     Hybrid Journal   (Followers: 4)
Icarus     Hybrid Journal   (Followers: 75)
International Journal of Advanced Astronomy     Open Access   (Followers: 28)
International Journal of Astrobiology     Hybrid Journal   (Followers: 4)
International Journal of Astronomy     Open Access   (Followers: 19)
International Journal of Astronomy and Astrophysics     Open Access   (Followers: 29)
International Journal of Satellite Communications Policy and Management     Hybrid Journal   (Followers: 13)
International Letters of Chemistry, Physics and Astronomy     Open Access   (Followers: 12)
ISRN Astronomy and Astrophysics     Open Access   (Followers: 7)
Journal for the History of Astronomy     Full-text available via subscription   (Followers: 19)
Journal of Astrobiology & Outreach     Open Access   (Followers: 3)
Journal of Astronomical Instrumentation     Open Access   (Followers: 3)
Journal of Astronomical Telescopes, Instruments, and Systems     Hybrid Journal   (Followers: 5)
Journal of Astrophysics     Open Access   (Followers: 26)
Journal of Astrophysics and Astronomy     Open Access   (Followers: 52)
Journal of Atmospheric and Solar-Terrestrial Physics     Hybrid Journal   (Followers: 199)
Journal of Cosmology and Astroparticle Physics     Hybrid Journal   (Followers: 38)
Journal of Geophysical Research : Planets     Full-text available via subscription   (Followers: 178)
Journal of Geophysical Research : Space Physics     Full-text available via subscription   (Followers: 178)
Journal of High Energy Astrophysics     Full-text available via subscription   (Followers: 22)
Kinematics and Physics of Celestial Bodies     Hybrid Journal   (Followers: 10)
KronoScope     Hybrid Journal   (Followers: 1)
Macalester Journal of Physics and Astronomy     Open Access   (Followers: 4)
MNASSA : Monthly Notes of the Astronomical Society of South Africa     Full-text available via subscription   (Followers: 1)
Molecular Astrophysics     Full-text available via subscription   (Followers: 1)
Monthly Notices of the Royal Astronomical Society     Hybrid Journal   (Followers: 14)
Monthly Notices of the Royal Astronomical Society : Letters     Hybrid Journal  
Nature Astronomy     Hybrid Journal   (Followers: 8)
New Astronomy     Hybrid Journal   (Followers: 27)
New Astronomy Reviews     Full-text available via subscription   (Followers: 17)
Nonlinear Dynamics     Hybrid Journal   (Followers: 19)
NRIAG Journal of Astronomy and Geophysics     Open Access   (Followers: 5)
Open Astronomy     Open Access   (Followers: 2)
Physics of the Dark Universe     Open Access   (Followers: 4)
Planetary and Space Science     Hybrid Journal   (Followers: 101)
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: 2)
Publications of the Astronomical Society of Japan     Hybrid Journal   (Followers: 3)
Publications of the Astronomical Society of the Pacific     Full-text available via subscription   (Followers: 4)
Research & Reviews : Journal of Space Science & Technology     Full-text available via subscription   (Followers: 17)
Research in Astronomy and Astrophysics     Full-text available via subscription   (Followers: 29)
Revista Mexicana de Astronomía y Astrofísica     Open Access   (Followers: 2)
Science China Physics, Mechanics & Astronomy     Hybrid Journal   (Followers: 4)
Solar Physics     Hybrid Journal   (Followers: 34)
Solar System Research     Hybrid Journal   (Followers: 14)
Space Science International     Open Access   (Followers: 192)
Space Science Reviews     Hybrid Journal   (Followers: 97)
Space Weather     Full-text available via subscription   (Followers: 24)
Transport and Aerospace Engineering     Open Access   (Followers: 13)
Universe     Open Access   (Followers: 5)
Similar Journals
Journal Cover
Astrophysical Journal
Journal Prestige (SJR): 2.684
Citation Impact (citeScore): 4
Number of Followers: 19  
 
  Full-text available via subscription Subscription journal
ISSN (Print) 0004-637X - ISSN (Online) 1538-4357
Published by American Astronomical Society Homepage  [3 journals]
  • The Formation and Eruption of a Sigmoidal Filament Driven by Rotating
           Network Magnetic Fields
    • Authors: Jun Dai; Haisheng Ji, Leping Li, Jun Zhang, Huadong Chen
      First page: 66
      Abstract: We present the formation and eruption of a sigmoidal filament driven by rotating network magnetic fields (RNFs) near the center of the solar disk, which was observed by the 1 m aperture New Vacuum Solar Telescope at the Fuxian Solar Observatory on 2018 July 12. Counterclockwise RNFs twist two small-scale filaments at their northeastern foot-point region, giving a rotation of nearly 200° within about 140 minutes. The motion of the RNF has a tendency to accelerate at first and then decelerate obviously, as the average rotation speed increased from 10 to 150° hr −1 , and then slowed down to 50° hr −1 . Coalescence then occurs between filaments F1 and F2. Meanwhile the fine structures in the southwestern region of the filament was involved in another interaction of coalescence. The subsequent EUV brightening due to plasma heating is observed in the two interaction regions. These interacting structures, including F1, F2 and the fine structures in the southwestern re...
      Citation: The Astrophysical Journal
      PubDate: 2021-01-11T00:00:00Z
      DOI: 10.3847/1538-4357/abcaf4
      Issue No: Vol. 906, No. 2 (2021)
       
  • Escaping Outflows from Disintegrating Exoplanets: Day-side versus
           Night-side Escape
    • Authors: Wanying Kang; Feng Ding, Robin Wordsworth, Sara Seager
      First page: 67
      Abstract: Ultrahot disintegrating exoplanets have been detected with tails trailing behind and/or shooting ahead of them. These tails are believed to be made of dust that are formed out of the supersonic escaping flow that emanated from the permanent day side. Conserving angular momentum, this day-side escape flux would lead the planet in orbit. In order to explain the trailing tails in observation, radiation pressure, a repulsive force pushing the escape flow away from the host star, is considered to be necessary. We here investigate whether escape could be deflected to head away from the host star by the pressure gradient force. We demonstrate in an idealized framework that escape flux from the night side can occur, and sometimes, can be even stronger than the escape from the day-side. The night-side escape infers that escape flow could trail behind the planet in orbit by virtue of angular momentum conservation even without radiation pressure. We also find analytical approximations for ...
      Citation: The Astrophysical Journal
      PubDate: 2021-01-11T00:00:00Z
      DOI: 10.3847/1538-4357/abcaa7
      Issue No: Vol. 906, No. 2 (2021)
       
  • Properties of Galaxies in Cosmic Filaments around the Virgo Cluster
    • Authors: Youngdae Lee; Suk Kim, Soo-Chang Rey, Jiwon Chung
      First page: 68
      Abstract: We present the properties of galaxies in filaments around the Virgo cluster with respect to their vertical distance from the filament spine using the NASA–Sloan Atlas catalog. The filaments are mainly composed of low-mass, blue dwarf galaxies. We observe that the g − r color of galaxies becomes blue and stellar mass decreases with increasing vertical filament distance. The galaxies were divided into higher-mass ( ##IMG## [http://ej.iop.org/images/0004-637X/906/2/68/apjabcaa0ieqn1.gif] {${\rm{log}}({h}^{2}{M}_{\ast }/{M}_{\odot })\gt 8$} ) and lower-mass ( ##IMG## [http://ej.iop.org/images/0004-637X/906/2/68/apjabcaa0ieqn2.gif] {${\rm{log}}({h}^{2}{M}_{\ast }/{M}_{\odot })\leqslant 8$} ) subsamples. We also examine the distributions of g − r color, stellar mass, H α equivalent width (EW(H α )), near-ultraviolet(NUV) − r color, and H i fraction of the two subsamples with...
      Citation: The Astrophysical Journal
      PubDate: 2021-01-11T00:00:00Z
      DOI: 10.3847/1538-4357/abcaa0
      Issue No: Vol. 906, No. 2 (2021)
       
  • Does the Disk in the Hard State of XTE J1752–223 Extend to the Innermost
           Stable Circular Orbit'
    • Authors: Andrzej A. Zdziarski; Barbara De Marco, Michał Szanecki, Andrzej Niedźwiecki, Alex Markowitz
      First page: 69
      Abstract: The accreting black hole binary XTE J1752–223 was observed in a stable hard state for 25 days by the Rossi X-ray Timing Explorer (RXTE), yielding a 3–140 keV spectrum of unprecedented statistical quality. Its published model required a single-Comptonization spectrum reflecting from a disk close to the innermost stable circular orbit. We studied that model as well as a number of other single-Comptonization models (yielding similarly low inner radii), but found they violate a number of basic physical constraints, e.g., their compactness is much above the maximum allowed by pair equilibrium. We also studied the contemporaneous 0.55–6 keV spectrum from the Swift/X-ray Telescope and found it well fitted by an absorbed power law and a disk blackbody with the innermost temperature of 0.1 keV. The normalization of the disk blackbody corresponds to an inner radius of ≳20 gravitational radii and its temperature, to irradiation of the truncated disk by a hot inner flow. We have also develo...
      Citation: The Astrophysical Journal
      PubDate: 2021-01-11T00:00:00Z
      DOI: 10.3847/1538-4357/abca9c
      Issue No: Vol. 906, No. 2 (2021)
       
  • Torsional Alfvén Wave Cascade and Shocks Evolving in Solar Jets
    • Authors: S. Vasheghani Farahani; S. M. Hejazi, M. R. Boroomand
      First page: 70
      Abstract: The aim of this study is to model the nature of nonlinear torsional magnetohydrodynamic waves propagating in solar jets as they are elevated to the outer solar atmosphere. The contribution of sequential processes to the transfer of energy is taken under consideration: the nonlinear cascade and shock formation. Thus a straight magnetic cylinder embedded in a plasma with an initial magnetic field and parallel flow to the cylinder axis is implemented. To resemble a jet where the oscillation wavelength highly exceeds the radius, the second-order thin flux tube approximation proves adequate. A Cohen–Kulsrud type equation is presented, and its solution highly depends on the parameter presented in this study, which itself is constituted of various environmental and equilibrium conditions that affect the perturbations of the variables as well as the nonlinear forces connected to Alfvén wave propagation. The shock formation time of torsional waves is inversely proportional to the density...
      Citation: The Astrophysical Journal
      PubDate: 2021-01-11T00:00:00Z
      DOI: 10.3847/1538-4357/abca8c
      Issue No: Vol. 906, No. 2 (2021)
       
  • Dust Temperature of Compact Star-forming Galaxies at
           z ∼ 1–3 in 3D-HST/CANDELS
    • Authors: Zuyi Chen; Guanwen Fang, Zesen Lin, Hongxin Zhang, Guangwen Chen, Xu Kong
      First page: 71
      Abstract: Recent simulation studies suggest that the compaction of star-forming galaxies (SFGs) at high redshift might be a critical process, during which the central bulge is being rapidly built, followed by quenching of the star formation. To explore dust properties of SFGs with compact morphology, we investigate the dependence of dust temperature, T dust , on their size and star formation activity, using a sample of massive SFGs with ##IMG## [http://ej.iop.org/images/0004-637X/906/2/71/apjabc9bbieqn1.gif] {$\mathrm{log}({M}_{* }/{M}_{\odot })\gt 10$} at1 
      Citation: The Astrophysical Journal
      PubDate: 2021-01-11T00:00:00Z
      DOI: 10.3847/1538-4357/abc9bb
      Issue No: Vol. 906, No. 2 (2021)
       
  • Statistical Properties of Superflares on Solar-type Stars: Results Using
           All of the Kepler Primary Mission Data
    • Authors: Soshi Okamoto; Yuta Notsu, Hiroyuki Maehara, Kosuke Namekata, Satoshi Honda, Kai Ikuta, Daisaku Nogami, Kazunari Shibata
      First page: 72
      Abstract: We report the latest statistical analyses of superflares on solar-type (G-type main-sequence; effective temperature is 5100–6000 K) stars using all of the Kepler primary mission data and Gaia Data Release 2 catalog. We updated the flare detection method from our previous studies by using a high-pass filter to remove rotational variations caused by starspots. We also examined the sample biases on the frequency of superflares, taking into account gyrochronology and flare detection completeness. The sample sizes of solar-type and Sun-like stars (effective temperature is 5600–6000 K and rotation period is over 20 days in solar-type stars) are ∼4 and ∼12 times, respectively, compared with Notsu et al. As a result, we found 2341 superflares on 265 solar-type stars and 26 superflares on 15 Sun-like stars; the former increased from 527 to 2341 and the latter from three to 26 events compared with our previous study. This enabled us to have a more well-established view on the statistical ...
      Citation: The Astrophysical Journal
      PubDate: 2021-01-11T00:00:00Z
      DOI: 10.3847/1538-4357/abc8f5
      Issue No: Vol. 906, No. 2 (2021)
       
  • Observational Constraints on the Physical Properties of Interstellar Dust
           in the Post-Planck Era
    • Authors: Brandon S. Hensley; B. T. Draine
      First page: 73
      Abstract: We present a synthesis of the astronomical observations constraining the wavelength-dependent extinction, emission, and polarization from interstellar dust from UV to microwave wavelengths on diffuse Galactic sight lines. Representative solid-phase abundances for those sight lines are also derived. Given the sensitive new observations of polarized dust emission provided by the Planck satellite, we place particular emphasis on dust polarimetry, including continuum polarized extinction, polarization in the carbonaceous and silicate spectroscopic features, the wavelength-dependent polarization fraction of the dust emission, and the connection between optical polarized extinction and far-infrared polarized emission. Together, these constitute a set of constraints that should be reproduced by models of dust in the diffuse interstellar medium.
      Citation: The Astrophysical Journal
      PubDate: 2021-01-11T00:00:00Z
      DOI: 10.3847/1538-4357/abc8f1
      Issue No: Vol. 906, No. 2 (2021)
       
  • Cosmic Inference: Constraining Parameters with Observations and a Highly
           Limited Number of Simulations
    • Authors: Timur Takhtaganov; Zarija Lukić, Juliane Müller, Dmitriy Morozov
      First page: 74
      Abstract: Cosmological probes pose an inverse problem where the measurement result is obtained through observations, and the objective is to infer values of model parameters that characterize the underlying physical system—our universe, from these observations and theoretical forward-modeling. The only way to accurately forward-model physical behavior on small scales is via expensive numerical simulations, which are further “emulated” due to their high cost. Emulators are commonly built with a set of simulations covering the parameter space with Latin hypercube sampling and an interpolation procedure; the aim is to establish an approximately constant prediction error across the hypercube. In this paper, we provide a description of a novel statistical framework for obtaining accurate parameter constraints. The proposed framework uses multi-output Gaussian process emulators that are adaptively constructed using Bayesian optimization methods with the goal of maintaining a low emulation error...
      Citation: The Astrophysical Journal
      PubDate: 2021-01-11T00:00:00Z
      DOI: 10.3847/1538-4357/abc8ed
      Issue No: Vol. 906, No. 2 (2021)
       
  • Waves and Turbulence in the Very Local Interstellar Medium: From
           Macroscales to Microscales
    • Authors: Federico Fraternale; Nikolai V. Pogorelov
      First page: 75
      Abstract: Voyager 1 ( V1 ) has been exploring the heliospheric boundary layer in the very local interstellar medium (VLISM) since 2012 August. The measurements revealed a spectrum of fluctuations over a vast range of space and timescales, but the nature of these fluctuations continues to be an intriguing question. Numerous manifestations of turbulence cannot be explained using a single phenomenology. Weak shocks and compressions are the prominent features of the VLISM. We use high-resolution (48 s) measurements to perform a multiscale analysis of turbulence at V1 between the years of 2013.36 and 2019.0 (124–144 au from the Sun). On relatively large scales, wave trains of mixed compressible/transverse nature with the correlation scale in the range of 15–100 days dominate the spectrum of fluctuations. The observed magnetic field profiles are suggestive of a Burgers-like ( f −2 ) turbulence phenomenology induced by solar activity. We demonstrate that the level of ...
      Citation: The Astrophysical Journal
      PubDate: 2021-01-11T00:00:00Z
      DOI: 10.3847/1538-4357/abc88a
      Issue No: Vol. 906, No. 2 (2021)
       
  • Multiple Stellar Populations along the Red Horizontal Branch and Red Clump
           of Globular Clusters
    • Authors: E. Dondoglio; A. P. Milone, E. P. Lagioia, A. F. Marino, M. Tailo, G. Cordoni, S. Jang, M. Carlos
      First page: 76
      Abstract: We exploit multiband Hubble Space Telescope photometry to investigate multiple populations (MPs) along the red horizontal branches (HBs) and red clumps of 14 metal-rich globular clusters (GCs), including 12 Milky Way GCs and the Magellanic Cloud GCs NGC 1978 and NGC 416. Based on appropriate two-color diagrams, we find that the fraction of first-generation (1G) stars in Galactic GCs correlates with cluster mass, confirming previous results based on red-giant branch (RGB) stars. Magellanic Cloud GCs show higher fractions of 1G stars than Galactic GCs with similar masses, thus suggesting that the environment affects the MP phenomenon. We compared and combined our population fractions based on the HB with previous estimates from the MS and RGB, and we used ground-based UBVI photometry (available for NGC 104, NGC 5927, NGC 6366, and NGC 6838) to extend the investigation over a wide field of view. All studied GCs are consistent with flat distributions of 1G and second-generation (2G)...
      Citation: The Astrophysical Journal
      PubDate: 2021-01-11T00:00:00Z
      DOI: 10.3847/1538-4357/abc882
      Issue No: Vol. 906, No. 2 (2021)
       
  • New Horizons Observations of the Cosmic Optical Background
    • Authors: Tod R. Lauer; Marc Postman, Harold A. Weaver, John R. Spencer, S. Alan Stern, Marc W. Buie, Daniel D. Durda, Carey M. Lisse, A. R. Poppe, Richard P. Binzel, Daniel T. Britt, Bonnie J. Buratti, Andrew F. Cheng, W. M. Grundy, Mihaly Horányi, J. J. Kavelaars, Ivan R. Linscott, William B. McKinnon, Jeffrey M. Moore, J. I. Núñez, Catherine B. Olkin, Joel W. Parker, Simon B. Porter, Dennis C. Reuter, Stuart J. Robbins, Paul Schenk, Mark R. Showalter, Kelsi N. Singer, Anne J. Verbiscer, Leslie A. Young
      First page: 77
      Abstract: We used existing data from the New Horizons Long-range Reconnaissance Imager (LORRI) to measure the optical-band(0.4 ≲ λ ≲ 0.9 μ m) sky brightness within seven high–Galactic latitude fields. The average raw level measured while New Horizons was 42–45 au from the Sun is 33.2 ± 0.5 nW m −2 sr −1 . This is ∼10× as dark as the darkest sky accessible to the Hubble Space Telescope, highlighting the utility of New Horizons for detecting the cosmic optical background (COB). Isolating the COB contribution to the raw total required subtracting scattered light from bright stars and galaxies, faint stars below the photometric detection limit within the fields, and diffuse Milky Way light scattered by infrared cirrus. We removed newly identified residual zodiacal light from the IRIS 100 μ m all-sky maps to generate two different estimates for the diffuse Galactic light. Using these yielded a highly significant detection of the COB in the range 15.9 ± 4...
      Citation: The Astrophysical Journal
      PubDate: 2021-01-11T00:00:00Z
      DOI: 10.3847/1538-4357/abc881
      Issue No: Vol. 906, No. 2 (2021)
       
  • A Two-moment Radiation Hydrodynamics Scheme Applicable to Simulations of
           Planet Formation in Circumstellar Disks
    • Authors: Julio David Melon Fuksman; Hubert Klahr, Mario Flock, Andrea Mignone
      First page: 78
      Abstract: We present a numerical code for radiation hydrodynamics designed as a module for the freely available PLUTO code. We adopt a gray approximation and include radiative transfer following a two-moment approach by imposing the M1 closure to the radiation fields. This closure allows for a description of radiative transport in both the diffusion and free-streaming limits, and is able to describe highly anisotropic radiation transport as can be expected in the vicinity of an accreting planet in a protoplanetary disk. To reduce the computational cost caused by the timescale disparity between radiation and matter fields, we integrate their evolution equations separately in an operator-split way, using substepping to evolve the radiation equations. We further increase the code’s efficiency by adopting the reduced speed of light approximation (RSLA). Our integration scheme for the evolution equations of radiation fields relies on implicit-explicit schemes, in which radiation-matte...
      Citation: The Astrophysical Journal
      PubDate: 2021-01-11T00:00:00Z
      DOI: 10.3847/1538-4357/abc879
      Issue No: Vol. 906, No. 2 (2021)
       
  • On the Occurrence of Type IV Solar Radio Bursts in Solar Cycle 24 and
           Their Association with Coronal Mass Ejections
    • Authors: Anshu Kumari; D. E. Morosan, E. K. J. Kilpua
      First page: 79
      Abstract: Solar activities, in particular coronal mass ejections (CMEs), are often accompanied by bursts of radiation at meter wavelengths. Some of these bursts have a long duration and extend over a wide frequency band, namely, type IV radio bursts. However, the association of type IV bursts with CMEs is still not well understood. In this article, we perform the first statistical study of type IV solar radio bursts in solar cycle 24. Our study includes a total of 446 type IV radio bursts that occurred during this cycle. Our results show that a clear majority, ∼81% of type IV bursts, were accompanied by CMEs, based on a temporal association with white-light CME observations. However, we found that only ∼2.2% of the CMEs are accompanied by type IV radio bursts. We categorized the type IV bursts as moving or stationary based on their spectral characteristics and found that only ∼18% of the total type IV bursts in this study were moving type IV bursts. Our study suggests that type IV bursts ...
      Citation: The Astrophysical Journal
      PubDate: 2021-01-11T00:00:00Z
      DOI: 10.3847/1538-4357/abc878
      Issue No: Vol. 906, No. 2 (2021)
       
  • The CARMA-NRO Orion Survey: Filament Formation via Collision-induced
           Magnetic Reconnection—the Stick in Orion A
    • Authors: Shuo Kong; Volker Ossenkopf-Okada, Héctor G. Arce, John Bally, Álvaro Sánchez-Monge, Peregrine McGehee, Sümeyye Suri, Ralf S. Klessen, John M. Carpenter, Dariusz C. Lis, Fumitaka Nakamura, Peter Schilke, Rowan J. Smith, Steve Mairs, Alyssa Goodman, María José Maureira
      First page: 80
      Abstract: A unique filament is identified in the Herschel maps of the Orion A giant molecular cloud. The filament, which we name the Stick, is ruler-straight and at an early evolutionary stage. Transverse position–velocity diagrams show two velocity components closing in on the Stick. The filament shows consecutive rings/forks in C 18 O (1−0) channel maps, which is reminiscent of structures generated by magnetic reconnection. We propose that the Stick formed via collision-induced magnetic reconnection (CMR). We use the magnetohydrodynamics code Athena++ to simulate the collision between two diffuse molecular clumps, each carrying an antiparallel magnetic field. The clump collision produces a narrow, straight, dense filament with a factor of>200 increase in density. The production of the dense gas is seven times faster than freefall collapse. The dense filament shows ring/fork-like structures in radiative transfer maps. Cores in the filament are confined by surface magnetic pr...
      Citation: The Astrophysical Journal
      PubDate: 2021-01-11T00:00:00Z
      DOI: 10.3847/1538-4357/abc687
      Issue No: Vol. 906, No. 2 (2021)
       
  • Lorentz–Lorenz Coefficient of Ice Molecules of Astrophysical Interest: N
           2 , CO 2 , NH 3 , CH 4 , CH 3 OH, C 2 H 4 , and C 2 H 6
    • Authors: M. Domingo; R. Luna, M. Á. Satorre, C. Santonja, C. Millán
      First page: 81
      Abstract: This work calculates the Lorentz–Lorenz coefficient with the refractive index and density values of various molecules in their solid phase measured in our laboratory under astrophysical conditions. This was completed for a range of temperatures from 13 K to close to the sublimation temperature for each molecule. The studied molecules were N 2 , CO 2 , NH 3 , CH 4 , CH 3 OH, C 2 H 4 , and C 2 H 6 . For CO 2 , our results match those found in the unique similar previous work in the literature. The results obtained for NH 3 and CH 3 OH are relevant because they confirm that the procedure adopted is applicable also to polar molecules. The study presented here updates the previous work on these molecules by focusing on their solid states under astrophysical conditions and at a range of temperatures. The knowledge of the Lorentz–Lorenz coefficient in a specific temperature rang...
      Citation: The Astrophysical Journal
      PubDate: 2021-01-11T00:00:00Z
      DOI: 10.3847/1538-4357/abc5c5
      Issue No: Vol. 906, No. 2 (2021)
       
 
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