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  • 更新日期:2020-08-14
  • Evidence for a Supergalactic Structure of Magnetic Deflection Multiplets of Ultra-high-energy Cosmic Rays
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-13
    R. U. Abbasi, M. Abe, T. Abu-Zayyad, M. Allen, R. Azuma, E. Barcikowski, J. W. Belz, D. R. Bergman, S. A. Blake, R. Cady, B. G. Cheon, J. Chiba, M. Chikawa, A. di Matteo, T. Fujii, K. Fujisue, K. Fujita, R. Fujiwara, M. Fukushima, G. Furlich, W. Hanlon, M. Hayashi, N. Hayashida, K. Hibino, R. Higuchi, K. Honda, D. Ikeda, T. Inadomi, N. Inoue, T. Ishii, R. Ishimori, H. Ito, D. Ivanov, H. Iwakura, H

    Evidence for a large-scale supergalactic cosmic-ray multiplet (arrival directions correlated with energy) structure is reported for ultra-high-energy cosmic-ray (UHECR) energies above 10 19 eV using 7 years of data from the Telescope Array (TA) surface detector and updated to 10 years. Previous energy–position correlation studies have made assumptions regarding magnetic field shapes and strength, and

    更新日期:2020-08-14
  • Testing the Kerr Black Hole Hypothesis Using X-Ray Reflection Spectroscopy and a Thin Disk Model with Finite Thickness
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-13
    Askar B. Abdikamalov, Dimitry Ayzenberg, Cosimo Bambi, Thomas Dauser, Javier A. García, Sourabh Nampalliwar, Ashutosh Tripathi, and Menglei Zhou

    X-ray reflection spectroscopy is a powerful tool for probing the strong gravity region of black holes and can be used for testing general relativity in the strong field regime. Simplifications of the available relativistic reflection models limit the capability of performing accurate measurements of the properties of black holes. In this paper, we present an extension of the model relxill _ nk in which

    更新日期:2020-08-14
  • Relating the Structure of Dark Matter Halos to Their Assembly and Environment
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-13
    Yangyao Chen, H. J. Mo, Cheng Li, Huiyuan Wang, Xiaohu Yang, Youcai Zhang, and Kai Wang

    We use a large N -body simulation to study the relation of the structural properties of dark matter halos to their assembly history and environment. The complexity of individual halo assembly histories can be well described by a small number of principal components (PCs), which, compared to formation times, provide a more complete description of halo assembly histories and have a stronger correlation

    更新日期:2020-08-14
  • The Morphology–Density Relationship in1 < z < 2 Clusters
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-13
    Elizaveta Sazonova, Katherine Alatalo, Jennifer Lotz, Kate Rowlands, Gregory F. Snyder, Kyle Boone, Mark Brodwin, Brian Hayden, Lauranne Lanz, Saul Perlmutter, and Vicente Rodriguez-Gomez

    The morphology–density relationship states that dense cosmic environments such as galaxy clusters have an overabundance of quiescent elliptical galaxies, but it is unclear at which redshift this relationship is first established. We study the morphology of four clusters with1.2 < z < 1.8 using Hubble Space Telescope imaging and the morphology computation code statmorph . By comparing the median morphology

    更新日期:2020-08-14
  • The Kinematics of Massive Quiescent Galaxies at1.4 < z < 2.1: Dark Matter Fractions, IMF Variation, and the Relation to Local Early-type Galaxies
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-13
    J. Trevor Mendel, Alessandra Beifiori, Roberto P. Saglia, Ralf Bender, Gabriel B. Brammer, Jeffrey Chan, Natascha M. Förster Schreiber, Matteo Fossati, Audrey Galametz, Ivelina G. Momcheva, Erica J. Nelson, David J. Wilman, and Stijn Wuyts

    We study the dynamical properties of massive quiescent galaxies at1.4 < z < 2.1 using deep Hubble Space Telescope WFC3/F160W imaging and a combination of literature stellar velocity dispersion measurements and new near-infrared spectra obtained using the K -band Multi Object Spectrograph (KMOS) on the ESO Very Large Telescope. We use these data to show that the typical dynamical-to-stellar mass ratio

    更新日期:2020-08-14
  • Common Envelope Wind Tunnel: Range of Applicability and Self-similarity in Realistic Stellar Envelopes
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-13
    Rosa Wallace Everson, Morgan MacLeod, Soumi De, Phillip Macias, and Enrico Ramirez-Ruiz

    Common envelope evolution, the key orbital tightening phase of the traditional formation channel for close binaries, is a multistage process that presents many challenges to the establishment of a fully descriptive, predictive theoretical framework. In an approach complementary to global 3D hydrodynamical modeling, we explore the range of applicability for a simplified drag formalism that incorporates

    更新日期:2020-08-14
  • Intrinsic Morphology of Ultra-diffuse Galaxies
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-13
    Yu Rong, Xiao-Yu Dong, Thomas H. Puzia, Gaspar Galaz, Ruben Sánchez-Janssen, Tianwen Cao, Remco F. J. van der Burg, Cristóbal Sifón, Pavel E. Mancera Piña, Mora Marcelo, Giuseppe D’Ago, Hong-Xin Zhang, Evelyn J. Johnston, and Paul Eigenthaler

    With the published data of apparent axis ratios for 1109 ultra-diffuse galaxies (UDGs) located in 17 low-redshift ( z ∼ 0.020–0.063) galaxy clusters and 84 UDGs in two intermediate-redshift ( z ∼ 0.308–0.348) clusters, we take advantage of a Markov Chain Monte Carlo approach and assume a triaxial model to investigate the intrinsic morphologies of UDGs. In contrast to the conclusion of Burkert, i.e

    更新日期:2020-08-14
  • A Catalog of 531 White Dwarf Candidates in the Local Galactic Halo from Gaia Data Release 2
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-13
    Bokyoung Kim, Sebastien Lépine, and Ilija Medan

    We present a catalog of 531 white dwarf candidates that have large apparent transverse motions relative to the Sun ( ##IMG## [http://ej.iop.org/images/0004-637X/899/1/83/apjaba523ieqn1.gif] {${v}_{T}\gt 200$} km s −1 ), thus making them likely members of the local Galactic halo population. The candidates were selected from the Gaia Data Release 2 and are located in a great circle with 20° width running

    更新日期:2020-08-14
  • The Discovery of a Hidden Broad-line AGN in a Bulgeless Galaxy: Keck NIR Spectroscopic Observations of SDSS J085153.64+392611.76
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-13
    Thomas Bohn, Gabriela Canalizo, Shobita Satyapal, and Ryan W. Pfeifle

    We report the discovery of a buried, active supermassive black hole (SMBH) in SDSS J085153.64+392611.76, a bulgeless Seyfert 2 (Sy2) galaxy. Keck near-infrared observations reveal a hidden broad-line region, allowing for the rare case where strong constraints can be placed on both the BH mass and bulge component. Using virial mass estimators, we obtain a BH mass of log( M BH / M ⊙ ) = 6.78 ± 0.50.

    更新日期:2020-08-14
  • A Detailed Study of Massive Galaxies in a Protocluster at z = 3.13
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-13
    Ke Shi, Jun Toshikawa, Zheng Cai, Kyoung-Soo Lee, and Taotao Fang

    We present a detailed study of near-IR selected galaxies in a protocluster field at z = 3.13. Protocluster galaxies are selected using the available mutliwavelength data with the photometric redshifts (photo- z ) at2.9 < z < 3.3, reaching a mass completeness of ##IMG## [http://ej.iop.org/images/0004-637X/899/1/79/apjaba626ieqn1.gif] {$\simeq {10}^{10}\,{M}_{\odot }$} . Diverse types of galaxies have

    更新日期:2020-08-14
  • Bar Classification Based on the Potential Map
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-13
    Yun Hee Lee, Myeong-Gu Park, Hong Bae Ann, Taehyun Kim, and Woo-Young Seo

    We introduce a new approach to classify barred galaxies that utilizes the transverse-to-radial force ratio map (ratio map, hereafter) in a different manner from previous studies. When we display the ratio map in polar coordinates, barred galaxies appear as four aligned, horizontal thick slabs. This characteristic feature enables us to successfully classify barred and nonbarred galaxies with an accuracy

    更新日期:2020-08-14
  • A Black Hole Feedback Valve in Massive Galaxies
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-12
    G. Mark Voit, Greg L. Bryan, Deovrat Prasad, Rachel Frisbie, Yuan Li, Megan Donahue, Brian W. O’Shea, Ming Sun, and Norbert Werner

    Star formation in the universe’s most massive galaxies proceeds furiously early in time but then nearly ceases. Plenty of hot gas remains available but does not cool and condense into star-forming clouds. Active galactic nuclei (AGNs) release enough energy to inhibit cooling of the hot gas, but energetic arguments alone do not explain why quenching of star formation is most effective in high-mass galaxies

    更新日期:2020-08-14
  • The Sloan Digital Sky Survey Reverberation Mapping Project: The H β Radius–Luminosity Relation
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-12
    Gloria Fonseca Alvarez, Jonathan R. Trump, Y. Homayouni, C. J. Grier, Yue Shen, Keith Horne, Jennifer I-Hsiu Li, W. N. Brandt, Luis C. Ho, B. M. Peterson, and D. P. Schneider

    Results from a few decades of reverberation mapping (RM) studies have revealed a correlation between the radius of the broad-line emitting region (BLR) and the continuum luminosity of active galactic nuclei. This “radius–luminosity” relation enables survey-scale black hole mass estimates across cosmic time, using relatively inexpensive single-epoch spectroscopy, rather than intensive RM time monitoring

    更新日期:2020-08-14
  • A Multiwavelength Study of the γ -Ray Binary Candidate HESS J1832–093
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-12
    Pak-Hin Thomas Tam, K. K. Lee, Yudong Cui, C. P. Hu, A. K. H. Kong, K. L. Li, Vlad Tudor, Xinbo He, and Partha S. Pal

    We investigate the nature of the unidentified very-high-energy γ -ray object, HESS J1832–093, in a multiwavelength context. Based on X-ray variability and spectral index ( ##IMG## [http://ej.iop.org/images/0004-637X/899/1/75/apjab9e76ieqn1.gif] {${{\rm{\Gamma }}}_{X}\sim \,1.5$} ), and its broadband spectrum, which was remarkably similar to that of HESS J0632+057—a confirmed γ -ray binary—HESS J1832–093

    更新日期:2020-08-14
  • Astrophysical Distance Scale. II. Application of the JAGB Method: A Nearby Galaxy Sample
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-12
    Wendy L. Freedman and Barry F. Madore

    We apply the near-infrared J-region asymptotic giant branch (JAGB) method, recently introduced by Madore & Freedman, to measure the distances to 14 nearby galaxies out to 4 Mpc. We use the geometric detached eclipsing binary (DEB) distances to the LMC and SMC as independent zero-point calibrators. We find excellent agreement with previously published distances based on the tip of the red giant branch

    更新日期:2020-08-14
  • Constraints of the Formation and Abundances of Methyl Carbamate, a Glycine Isomer, in Hot Corinos
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-12
    Dipen Sahu, Sheng-Yuan Liu, Ankan Das, Prasanta Garai, and Valentine Wakelam

    Methyl carbamate CH 3 OC(O)NH 2 is an isomer of glycine. Quantum chemical analyses show that methyl carbamate is a more stable isomer than glycine. Because of this, there could be a higher chance for methyl carbamate to exist in the interstellar medium (ISM) as compared to glycine. Despite immense searches, until now glycine has not been detected in the ISM; therefore, it is worthwhile to search its

    更新日期:2020-08-14
  • An Extremely Bright QSO at z = 2.89
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-12
    Sarik Jeram, Anthony Gonzalez, Stephen Eikenberry, Daniel Stern, Claudia Lucia Mendes de Oliveira, Lilianne Mariko Izuti Nakazono, and Kendall Ackley

    We report the discovery and confirmation of a bright quasi-stellar object (QSO), 2MASS J13260399 + 7023462, at ##IMG## [http://ej.iop.org/images/0004-637X/899/1/76/apjab9c95ieqn1.gif] {$z=2.889$} . This QSO is the first spectroscopically confirmed candidate from an ongoing search using the combination of Gaia and Wide-field Infrared Survey Explorer photometry to identify bright QSOs at z > 2, the redshift

    更新日期:2020-08-14
  • Dynamics of the Parker–Jeans Instability of Gaseous Disks Including the Effect of Cosmic Rays
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-12
    Takuhito Kuwabara and Chung-Ming Ko

    The effect of cosmic rays on the Parker–Jeans instability in magnetized self-gravitating gaseous disks is studied using three-dimensional magnetohydrodynamic simulations with cosmic rays taken as a massless fluid with notable pressure. Cosmic-ray diffusion along the magnetic field is taken into account in the simulation. The initial configuration of the disk is a magnetized cold gas slab sandwiched

    更新日期:2020-08-14
  • Spatially Resolved Ultraviolet Spectroscopy of the Great Dimming of Betelgeuse
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-12
    Andrea K. Dupree, Klaus G. Strassmeier, Lynn D. Matthews, Han Uitenbroek, Thomas Calderwood, Thomas Granzer, Edward F. Guinan, Reimar Leike, Miguel Montargès, Anita M. S. Richards, Richard Wasatonic, and Michael Weber

    The bright supergiant Betelgeuse (Alpha Orionis, HD 39801) experienced a visual dimming during 2019 December and the first quarter of 2020, reaching an historic minimum 2020 February 7–13. During 2019 September–November, prior to the optical dimming event, the photosphere was expanding. At the same time, spatially resolved ultraviolet spectra using the Hubble Space Telescope/Space Telescope Imaging

    更新日期:2020-08-14
  • Testing the Cosmic Opacity at Higher Redshifts: Implication from Quasars with Available UV and X-Ray Observations
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-12
    Tonghua Liu, Shuo Cao, Marek Biesiada, Yuting Liu, Shuaibo Geng, and Yujie Lian

    In this paper, we present a cosmological model-independent test for the cosmic opacity at high redshifts ( z ∼ 5). We achieve this with the opacity-dependent luminosity distances derived from the nonlinear relation between X-ray and UV emissions of quasars, combined with two types of opacity-independent luminosity distances derived from the Hubble parameter measurements and simulated gravitational

    更新日期:2020-08-14
  • The Next Generation Virgo Cluster Survey (NGVS). XXX. Ultra-diffuse Galaxies and Their Globular Cluster Systems
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-12
    Sungsoon Lim, Patrick Côté, Eric W. Peng, Laura Ferrarese, Joel C. Roediger, Patrick R. Durrell, J. Christopher Mihos, Kaixiang Wang, S. D. J. Gwyn, Jean-Charles Cuillandre, Chengze Liu, Rubén Sánchez-Janssen, Elisa Toloba, Laura V. Sales, Puragra Guhathakurta, Ariane Lançon, and Thomas H. Puzia

    We present a study of ultra-diffuse galaxies (UDGs) in the Virgo Cluster based on deep imaging from the Next Generation Virgo Cluster Survey. Applying a new definition for the UDG class based on galaxy scaling relations, we define samples of 44 and 26 UDGs using expansive and restrictive selection criteria, respectively. Our UDG sample includes objects that are significantly fainter than previously

    更新日期:2020-08-14
  • The Electromagnetic Signature of Outward Propagating Ion-scale Waves
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-12
    Trevor A. Bowen, Stuart D. Bale, J. W. Bonnell, Davin Larson, Alfred Mallet, Michael D. McManus, Forrest S. Mozer, Marc Pulupa, Ivan Y. Vasko and J. L. Verniero (The PSP/FIELDS and PSP/SWEAP Teams)

    First results from the Parker Solar Probe (PSP) mission have revealed ubiquitous coherent ion-scale waves in the inner heliosphere, which are signatures of kinetic wave–particle interactions and fluid instabilities. However, initial studies of the circularly polarized ion-scale waves observed by PSP have only thoroughly analyzed magnetic field signatures, precluding a determination of solar wind frame

    更新日期:2020-08-14
  • Astrophysical Distance Scale: The AGB J -band Method. I. Calibration and a First Application
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-12
    Barry F. Madore and Wendy L. Freedman

    A near-infrared, color-selected subset of carbon-rich asymptotic giant branch (C-AGB) stars is found to have tightly constrained luminosities in the near-infrared J band. Based on JK photometry of some 3300 C-AGB stars in the bar of the Large Magellanic Cloud (LMC) we find that these stars have a constant absolute magnitude of ##IMG## [http://ej.iop.org/images/0004-637X/899/1/66/apjaba045ieqn1.gif]

    更新日期:2020-08-14
  • Magnetohydrodynamics with Post-Newtonian Corrections
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-11
    Jai-chan Hwang and Hyerim Noh

    Using the fully nonlinear and exact perturbation formulation with magnetohydrodynamics (MHD) in the Minkowski background, we derive first-order, post-Newtonian (1PN) equations without imposing the slicing (temporal gauge) condition. The 1PN-MHD formulation is complementary to our recently presented fully relativistic MHD combined with 0PN gravity available only in the maximal slicing. We present the

    更新日期:2020-08-12
  • Physical Implications of the Subthreshold GRB GBM-190816 and Its Associated Subthreshold Gravitational-wave Event
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-11
    Yi-Si Yang, Shu-Qing Zhong, Bin-Bin Zhang, Shichao Wu, Bing Zhang, Yu-Han Yang, Zhoujian Cao, He Gao, Jin-Hang Zou, Jie-Shuang Wang, Hou-Jun Lü, Ji-Rong Cang, and Zi-Gao Dai

    The LIGO/Virgo and Fermi collaborations recently reported a possible joint detection of a subthreshold gravitational-wave (GW) event and a subthreshold gamma-ray burst (GRB), GBM-190816, that occurred 1.57 s after the merger. We perform an independent analysis of the publicly available data and investigate the physical implications of this potential association. By carefully studying the following

    更新日期:2020-08-12
  • The Role of Clouds on the Depletion of Methane and Water Dominance in the Transmission Spectra of Irradiated Exoplanets
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-11
    Karan Molaverdikhani, Thomas Henning, and Paul Mollière

    Observations suggest an abundance of water and a paucity of methane in the majority of observed exoplanetary atmospheres. We isolate the effect of atmospheric processes to investigate possible causes. Previously, we studied the effect of effective temperature, surface gravity, metallicity, carbon-to-oxygen ratio, and stellar type assuming cloud-free thermochemical equilibrium and disequilibrium chemistry

    更新日期:2020-08-12
  • Line Oscillator Strengths for the ##IMG## [http://ej.iop.org/images/0004-637X/899/1/57/toc_apjaba049ieqn1.gif] {${{{\rm{c}}}_{4}}^{{\prime} 1}{{{\rm{\Sigma }}}_{{\rm{u}}}}^{+}(4)\mbox{--}{{\rm{X}}}^{1}{{{\rm{\Sigma }}}_{{\rm{g}}}}^{+}(0\mbox{--}7)$} Absorption Bands of N
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-11
    A. M. Velasco and C. Lavín

    Theoretical absorption oscillator strengths for rotational lines of the ##IMG## [http://ej.iop.org/images/0004-637X/899/1/57/apjaba049ieqn3.gif] {${{{\rm{c}}}_{4}}^{{\prime} 1}{{{\rm{\Sigma }}}_{{\rm{u}}}}^{+}(4)$} – ##IMG## [http://ej.iop.org/images/0004-637X/899/1/57/apjaba049ieqn4.gif] {${{\rm{X}}}^{1}{{{\rm{\Sigma }}}_{{\rm{g}}}}^{+}$} (0–7) bands of N 2 , which are relevant to analyze the spectra

    更新日期:2020-08-12
  • Kinetic Simulations of Radiative Magnetic Reconnection in the Coronae of Accreting Black Holes
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-11
    Lorenzo Sironi and Andrei M. Beloborodov

    We perform 2D and 3D particle-in-cell simulations of reconnection in magnetically dominated e ± plasmas subject to strong Compton cooling. Magnetic reconnection under such conditions can operate in accretion disk coronae around black holes, which produce hard X-rays through Comptonization. Our simulations show that most of the plasma in the reconnection layer is kept cold by Compton losses and locked

    更新日期:2020-08-12
  • Effects of Electron Temperature Anisotropy on Proton-beam Instability in the Solar Wind
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-11
    L. Xiang, K. H. Lee, D. J. Wu, and L. C. Lee

    Solar wind observations often show that the drift velocity of a proton beam relative to a background proton decreases with the heliocentric distance. Proton-beam instability has been suggested to play an important role in the deceleration of the proton-beam velocity; the effects of electron temperature anisotropy on the proton-beam instability have not been examined. Based on a general kinetic dispersion

    更新日期:2020-08-12
  • Direct Measurement of the Solar-wind Taylor Microscale Using MMS Turbulence Campaign Data
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-11
    Riddhi Bandyopadhyay, William H. Matthaeus, Alexandros Chasapis, Christopher T. Russell, Robert J. Strangeway, Roy B. Torbert, Barbara L. Giles, Daniel J. Gershman, Craig J. Pollock, and James L. Burch

    Using the novel Magnetospheric Multiscale (MMS) mission data accumulated during the 2019 MMS Solar Wind Turbulence Campaign, we calculate the Taylor microscale ( λ T ) of the turbulent magnetic field in the solar wind. The Taylor microscale represents the onset of dissipative processes in classical turbulence theory. However, an accurate estimation of the Taylor scale from spacecraft data is usually

    更新日期:2020-08-12
  • Stellar Parameters for the First Release of the MaSTar Library: An Empirical Approach
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-11
    Yan-Ping Chen, Renbin Yan, Claudia Maraston, Daniel Thomas, Guy S. Stringfellow, Dmitry Bizyaev, Joseph D Gelfand, Timothy C. Beers, José G. Fernández-Trincado, Daniel Lazarz, Lewis Hill, Niv Drory, and Keivan G. Stassun

    We report the stellar atmospheric parameters for 7503 spectra contained in the first release of the Mapping Nearby Galaxies at Apache Point Observatory survey (MaNGA) stellar library (MaStar) in Sloan Digital Sky Survey DR15. The first release of MaStar contains 8646 spectra measured from 3321 unique stars, each covering the wavelength range 3622–10354 Å with a resolving power of R ∼ 1800. In this

    更新日期:2020-08-12
  • Search for Alignment of Disk Orientations in Nearby Star-forming Regions: Lupus, Taurus, Upper Scorpius, ρ Ophiuchi, and Orion
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-11
    Masataka Aizawa, Yasushi Suto, Yoko Oya, Shiro Ikeda, and Takeshi Nakazato

    Spatial correlations among protoplanetary disk orientations carry unique information on physics of multiple-star formation processes. We select five nearby star-forming regions that comprise a number of protoplanetary disks with spatially resolved images with ALMA and Hubble Space Telescope, and we search for the mutual alignment of the disk axes. Specifically, we apply the Kuiper test to examine the

    更新日期:2020-08-12
  • A Systematic Study on the Rise Time–Peak Luminosity Relation for Bright Optical Transients Powered by Wind Shock Breakout
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-11
    Akihiro Suzuki, Takashi J. Moriya, and Tomoya Takiwaki

    A number of astrophysical transients originating from stellar explosions are powered by the collision of the ejected material with the circumstellar medium, which efficiently produces thermal radiation via shock dissipation. We investigate how such interaction-powered transients are distributed in the peak bolometric luminosity versus the rise time phase space. Taking advantage of less time-consuming

    更新日期:2020-08-12
  • The Dynamic Proto-atmospheres around Low-mass Planets with Eccentric Orbits
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-11
    Chuhong Mai, Steven J. Desch, Rolf Kuiper, Gabriel-Dominique Marleau, and Cornelis Dullemond

    Protoplanets are able to accrete primordial atmospheres when embedded in the gaseous protoplanetary disk. The formation and structure of the proto-atmosphere are subject to the planet–disk environment and orbital effects. In particular, when planets are on eccentric orbits, their velocities relative to the gas can exceed the sound speed. The planets generate atmosphere-stripping bow shocks. We investigate

    更新日期:2020-08-12
  • Environmental Impact on Star-forming Galaxies in a z ∼ 0.9 Cluster during the Course of Galaxy Accretion
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-11
    Tetsuro Asano, Tadayuki Kodama, Kentaro Motohara, Lori Lubin, Brian C. Lemaux, Roy Gal, Adam Tomczak, Dale Kocevski, Masao Hayashi, Yusei Koyama, Ichi Tanaka, Tomoko L. Suzuki, Naoaki Yamamoto, Daiki Kimura, Masahiro Konishi, Hidenori Takahashi, Yasunori Terao, Kosuke Kushibiki, Yukihiro Kono, Yuzuru Yoshii, and The SWIMS Team

    Galaxies change their properties as they assemble into clusters. In order to understand the physics behind that, we need to go back in time and observe directly what is occurring in galaxies as they fall into a cluster. We have conducted a narrowband and J -band imaging survey on a cluster CL1604-D at z = 0.923 using a new infrared instrument SWIMS installed at the Subaru Telescope. The narrowband

    更新日期:2020-08-12
  • The VLA-COSMOS 3 GHz Large Project: Evolution of Specific Star Formation Rates out to z ∼ 5
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-11
    Sarah K. Leslie, Eva Schinnerer, Daizhong Liu, Benjamin Magnelli, Hiddo Algera, Alexander Karim, Iary Davidzon, Ghassem Gozaliasl, Eric F. Jiménez-Andrade, Philipp Lang, Mark T. Sargent, Mladen Novak, Brent Groves, Vernesa Smolčić, Giovanni Zamorani, Mattia Vaccari, Andrew Battisti, Eleni Vardoulaki, Yingjie Peng, and Jeyhan Kartaltepe

    We provide a coherent, uniform measurement of the evolution of the logarithmic star formation rate (SFR)–stellar mass ( M * ) relation, called the main sequence (MS) of star-forming galaxies , for star-forming and all galaxies out to ##IMG## [http://ej.iop.org/images/0004-637X/899/1/58/apjaba044ieqn1.gif] {$z\sim 5$} . We measure the MS using mean stacks of 3 GHz radio-continuum images to derive average

    更新日期:2020-08-12
  • ‘Oumuamua’s Rotation with the Mechanical Torque Produced by Interstellar Medium
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-10
    Wen Han Zhou

    The first interstellar object ‘Oumuamua was discovered in 2017. When ‘Oumuamua travels in interstellar space, it keeps colliding with the interstellar medium (ISM). Given a sufficiently long interaction time, its rotation state may change significantly because of the angular momentum transfer with the interstellar medium. Using generated Gaussian random spheres with dimension ratios 6:1:1 and 5:5:1

    更新日期:2020-08-11
  • Effects of Superthermal Plasmas on the Linear Growth of Multiband EMIC Waves
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-10
    Xing Cao, Binbin Ni, Danny Summers, Xin Ma, Yuequn Lou, Yang Zhang, Xudong Gu, and Song Fu

    Observations show that particle velocity distributions in space plasmas generally exhibit a non-Maxwellian high-energy tail that can be well fitted with kappa distributions. To better understand the correlation between realistic particle velocity distributions and plasma wave excitation, we investigate the linear cyclotron instability of multiband electromagnetic ion cyclotron (EMIC) waves in a kappa

    更新日期:2020-08-11
  • The Invariance of the Diffusion Coefficient with Iterative Operations of the Charged Particle Transport Equation
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-10
    J. F. Wang and G. Qin

    The spatial parallel diffusion coefficient (SPDC) is one of the important quantities describing energetic charged particle transport. There are three different definitions for the SPDC: the displacement variance definition ##IMG## [http://ej.iop.org/images/0004-637X/899/1/39/apjaba3c8ieqn1.gif] {${\kappa }_{{zz}}^{\mathrm{DV}}={\mathrm{lim}}_{t\to {t}_{\infty }}d{\sigma }^{2}/(2{dt})$} , the Fick’s

    更新日期:2020-08-11
  • Asteroseismic Analyses of Slowly Pulsating B Star KIC 8324482: Ultraweak Element Mixing beyond the Central Convective Core
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-10
    Tao Wu, Yan Li, Zhen-min Deng, Gui-fang Lin, Han-feng Song, and Chen Jiang

    Asteroseismology is a powerful tool for probing the inner structure and determining the evolutionary status and the fundamental parameters of stars. The oscillation spectra of slowly pulsating B (SPB) stars show almost uniform period spans, whose pattern is sensitive to the structure of the μ -gradient shell beyond the central convective core and hence can be used to efficiently describe their shapes

    更新日期:2020-08-11
  • Clustering of Fast Coronal Mass Ejections during Solar Cycles 23 and 24 and the Implications for CME–CME Interactions
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-10
    Jenny M. Rodríguez Gómez, Tatiana Podladchikova, Astrid Veronig, Alexander Ruzmaikin, Joan Feynman, and Anatoly Petrukovich

    We study the clustering properties of fast coronal mass ejections (CMEs) that occurred during solar cycles 23 and 24. We apply two methods: the Max Spectrum method can detect the predominant clusters, and the declustering threshold time method provides details on the typical clustering properties and timescales. Our analysis shows that during the different phases of solar cycles 23 and 24, CMEs with

    更新日期:2020-08-11
  • Relativistic Reflection and Reverberation in GX 339–4 with NICER and NuSTAR
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-10
    Jingyi Wang, Erin Kara, James F. Steiner, Javier A. García, Jeroen Homan, Joseph Neilsen, Grégoire Marcel, Renee M. Ludlam, Francesco Tombesi, Edward M. Cackett, and Ron A. Remillard

    We analyze seven Neutron Star Interior Composition Interior Explorer (NICER) and Nuclear Spectroscopic Telescope Array epochs of the black hole X-ray binary GX 339–4 in the hard state during its two most recent hard-only outbursts in 2017 and 2019. These observations cover the 1–100 keV unabsorbed luminosities between 0.3% and 2.1% of the Eddington limit. With NICER’s negligible pileup, high count

    更新日期:2020-08-11
  • A Comparison of the Stellar, CO, and Dust-continuum Emission from Three Star-forming HUDF Galaxies at z ∼ 2
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-10
    Melanie Kaasinen, Fabian Walter, Mladen Novak, Marcel Neeleman, Ian Smail, Leindert Boogaard, Elisabete da Cunha, Axel Weiss, Daizhong Liu, Roberto Decarli, Gergö Popping, Tanio Diaz-Santos, Paulo Cortés, Manuel Aravena, Paul van der Werf, Dominik Riechers, Hanae Inami, Jacqueline A. Hodge, Hans-Walter Rix, and Pierre Cox

    We compare the extent of the dust, molecular gas, and stars in three star-forming galaxies, at z = 1.4, 1.6, and 2.7, selected from the Hubble Ultra Deep Field based on their bright carbon monoxide (CO) and dust-continuum emission as well as their large rest-frame optical sizes. The galaxies have high stellar masses, ##IMG## [http://ej.iop.org/images/0004-637X/899/1/37/apjaba438ieqn1.gif] {${M}_{*

    更新日期:2020-08-11
  • On the Origin of Metal-poor Stars in the Solar Neighborhood
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-10
    Timur Şahin and Selçuk Bilir

    We determined the ages, kinematic parameters, and Galactic orbital parameters of six metal-poor (−2.4 < [Fe/H] < −1.0 dex), F-type, high-proper-motion (HPM) stars to investigate their HPM nature and origin. For the kinematical procedure, the astrometric data from the Gaia DR2 were used. High-resolution ELODIE spectra of the six dwarfs were also used to obtain accurate [Fe/H] abundances and up-to-date

    更新日期:2020-08-11
  • New Conductive Opacities for White Dwarf Envelopes
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-10
    Simon Blouin, Nathaniel R. Shaffer, Didier Saumon, and Charles E. Starrett

    Thanks to their continuous cooling and relative simplicity, white dwarf stars are routinely used to measure the ages of stellar populations. The usefulness of white dwarfs as cosmochronometers depends on the availability of accurate cooling models. A key ingredient of those models is conductive opacities, which largely govern the cooling rate. In this work, we present improved conductive opacities

    更新日期:2020-08-11
  • The 21 cm kSZ–kSZ Bispectrum during the Epoch of Reionization
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-10
    Paul La Plante, Adam Lidz, James Aguirre, and Saul Kohn

    Current and next-generation radio interferometers such as the Hydrogen Epoch of Reionization Array (HERA) and Square Kilometre Array are projected to measure the 21 cm auto-power spectrum from the Epoch of Reionization (EoR). Another observational signal of this era is the kinetic Sunyaev–Zel’dovich (kSZ) signal in the cosmic microwave background (CMB), which will be observed by the upcoming Simons

    更新日期:2020-08-11
  • Near-infrared [ ##IMG## [http://ej.iop.org/images/0004-637X/899/1/49/toc_apjab9cb3ieqn1.gif] {${\bf{Fe}}\,{\rm{\small{II}}$} ] and H 2 Line Mapping of the Supernova Remnant IC 443 with the IRSF/SIRIUS
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-10
    Takuma Kokusho, Hiroki Torii, Takahiro Nagayama, Hidehiro Kaneda, Hidetoshi Sano, Daisuke Ishihara, and Takashi Onaka

    We investigate properties of the interstellar medium (ISM) interacting with shocks around the Galactic supernova remnant IC 443, using the results of near-infrared [Fe ii ] and H 2 line mapping with the InfraRed Survey Facility/Simultaneous Infrared Imager for Unbiased Survey. In the present study, we newly performed H 2 1–0 S(1) and 2–1 S(1) line mapping with the narrowband filters tuned for these

    更新日期:2020-08-11
  • S62 and S4711: Indications of a Population of Faint Fast-moving Stars inside the S2 Orbit—S4711 on a 7.6 yr Orbit around Sgr A*
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-10
    Florian Peißker, Andreas Eckart, Michal Zajaček, Basel Ali, and Marzieh Parsa

    We present high-pass filtered NACO and SINFONI images of the newly discovered stars S4711–S4715 between 2004 and 2016. Our deep H + K -band (SINFONI) and K -band (NACO) data show the S-cluster star S4711 on a highly eccentric trajectory around Sgr A* with an orbital period of 7.6 yr and a periapse distance of 144 au to the supermassive black hole (SMBH). S4711 is hereby the star with the shortest orbital

    更新日期:2020-08-11
  • Early Ultraviolet Observations of Type IIn Supernovae Constrain the Asphericity of Their Circumstellar Material
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-10
    Maayane T. Soumagnac, Eran O. Ofek, Jingyi Liang, Avishay Gal-yam, Peter Nugent, Yi Yang, S. Bradley Cenko, Jesper Sollerman, Daniel A. Perley, Igor Andreoni, Cristina Barbarino, Kevin B. Burdge, Rachel J. Bruch, Kishalay De, Alison Dugas, Christoffer Fremling, Melissa L. Graham, Matthew J. Hankins, Nora Linn Strotjohann, Shane Moran, James D. Neill, Steve Schulze, David L. Shupe, Brigitta M. Sipőcz

    We present a survey of the early evolution of 12 Type IIn supernovae (SNe IIn) at ultraviolet and visible light wavelengths. We use this survey to constrain the geometry of the circumstellar material (CSM) surrounding SN IIn explosions, which may shed light on their progenitor diversity. In order to distinguish between aspherical and spherical CSM, we estimate the blackbody radius temporal evolution

    更新日期:2020-08-11
  • Inferring Contributions from Unresolved Point Sources to Diffuse Emissions Measured in UV Sky Surveys: General Method and SOHO/SWAN Case Study
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-10
    M. Strumik, M. Bzowski, I. Kowalska-Leszczynska, and M. A. Kubiak

    In observations of diffuse emissions like, e.g., the Ly α heliospheric glow, contributions to the observed signal from point sources (e.g., stars) are considered to be a contamination. There are relatively few bright point sources that are usually properly resolved and can be subtracted or masked. We present results of an analysis of the distribution of point sources using UV sky-survey maps from the

    更新日期:2020-08-11
  • Detailed Calculations of the Efficiency of Planetesimal Accretion in the Core-accretion Model
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-10
    Morris Podolak, Nader Haghighipour, Peter Bodenheimer, Ravit Helled, and Esther Podolak

    We present the results of a study of the accretion rate of planetesimals by a growing proto-Jupiter in the core-accretion model. The purpose of our study is to test the assumptions of Pollack et al. regarding the flux of planetesimals and their encounter velocities with the protoplanet. Using a newly developed code, we have accurately calculated planetesimals trajectories during their passage in the

    更新日期:2020-08-11
  • New High-quality Strong Lens Candidates with Deep Learning in the Kilo-Degree Survey
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-09
    R. Li, N. R. Napolitano, C. Tortora, C. Spiniello, L. V. E. Koopmans, Z. Huang, N. Roy, G. Vernardos, S. Chatterjee, B. Giblin, F. Getman, M. Radovich, G. Covone, and K. Kuijken

    We report new high-quality galaxy-scale strong lens candidates found in the Kilo-Degree Survey data release 4 using machine learning. We have developed a new convolutional neural network (CNN) classifier to search for gravitational arcs, following the prescription by Petrillo et al. and using only r -band images. We have applied the CNN to two “predictive samples”: a luminous red galaxy (LRG) and a

    更新日期:2020-08-10
  • Spin Evolution of Stellar-mass Black Hole Binaries in Active Galactic Nuclei
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-09
    Hiromichi Tagawa, Zoltán Haiman, Imre Bartos, and Bence Kocsis

    The astrophysical origin of gravitational-wave (GW) events is one of the most timely problems in the wake of the LIGO/Virgo discoveries. In active galactic nuclei (AGNs), binaries form and evolve efficiently by dynamical interactions and gaseous dissipation. Previous studies have suggested that binary black hole (BBH) mergers in AGN disks can contribute significantly to BBH mergers observed by GW interferometers

    更新日期:2020-08-10
  • Can the Kappa-distributed Electron Energies Account for the Intensity Ratios of O ii Lines in Photoionized Gaseous Nebulae?
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-09
    Bao-Zhi Lin and Yong Zhang

    A vexing puzzle in the study of planetary nebulae and H ii regions is that the plasma diagnostic results based on collisionally excited lines systematically differ from those based on recombination lines. A fairly speculative interpretation is the presence of nonthermal electrons with the so-called κ energy distributions, yet there is little observational evidence to verify or disprove this hypothesis

    更新日期:2020-08-10
  • An Eruptive Circular-ribbon Flare with Extended Remote Brightenings
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-09
    Chang Liu, Avijeet Prasad, Jeongwoo Lee, and Haimin Wang

    We study an eruptive X1.1 circular-ribbon flare on 2013 November 10, combining multiwavelength observations with a coronal field reconstruction using a non-force-free field method. In the first stage, a filament forms via magnetic reconnection between two mildly twisted sheared arcades, which are embedded under the fan dome associated with a null point (NP). This reconnection seems to be driven by

    更新日期:2020-08-10
  • Dark Matter Deficient Galaxies Produced via High-velocity Galaxy Collisions in High-resolution Numerical Simulations
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-09
    Eun-jin Shin, Minyong Jung, Goojin Kwon, Ji-hoon Kim, Joohyun Lee, Yongseok Jo, and Boon Kiat Oh

    The recent discovery of diffuse dwarf galaxies that are deficient in dark matter appears to challenge the current paradigm of structure formation in our universe. We describe numerical experiments to determine if so-called dark matter deficient galaxies (DMDGs) could be produced when two gas-rich, dwarf-sized galaxies collide with a high relative velocity of ∼300 km s −1 . Using idealized high-resolution

    更新日期:2020-08-10
  • The JCMT BISTRO Survey: Magnetic Fields Associated with a Network of Filaments in NGC 1333
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-09
    Yasuo Doi, Tetsuo Hasegawa, Ray S. Furuya, Simon Coudé, Charles L. H. Hull, Doris Arzoumanian, Pierre Bastien, Michael Chun-Yuan Chen, James Di Francesco, Rachel Friesen, Martin Houde, Shu-ichiro Inutsuka, Steve Mairs, Masafumi Matsumura, Takashi Onaka, Sarah Sadavoy, Yoshito Shimajiri, Mehrnoosh Tahani, Kohji Tomisaka, Chakali Eswaraiah, Patrick M. Koch, Kate Pattle, Chang Won Lee, Motohide Tamura

    We present new observations of the active star formation region NGC 1333 in the Perseus molecular cloud complex from the James Clerk Maxwell Telescope B -Fields In Star-forming Region Observations (BISTRO) survey with the POL-2 instrument. The BISTRO data cover the entire NGC 1333 complex (∼1.5 pc × 2 pc) at 0.02 pc resolution and spatially resolve the polarized emission from individual filamentary

    更新日期:2020-08-10
  • PLATON II: New Capabilities and a Comprehensive Retrieval on HD 189733b Transit and Eclipse Data
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-09
    Michael Zhang, Yayaati Chachan, Eliza M.-R. Kempton, Heather A. Knutson, and Wenjun (Happy) Chang

    Recently, we introduced PLanetary Atmospheric Tool for Observer Noobs ( PLATON ), a Python package that calculates model transmission spectra for exoplanets and retrieves atmospheric characteristics based on observed spectra. We now expand its capabilities to include the ability to compute secondary eclipse depths. We have also added the option to calculate models using the correlated- k method for

    更新日期:2020-08-10
  • TOI-1728b: The Habitable-zone Planet Finder Confirms a Warm Super-Neptune Orbiting an M-dwarf Host
    Astrophys. J.  (IF 5.745) Pub Date : 2020-08-09
    Shubham Kanodia, Caleb I. Cañas, Gudmundur Stefansson, Joe P. Ninan, Leslie Hebb, Andrea S. J. Lin, Helen Baran, Marissa Maney, Ryan C. Terrien, Suvrath Mahadevan, William D. Cochran, Michael Endl, Jiayin Dong, Chad F. Bender, Scott A. Diddams, Eric B. Ford, Connor Fredrick, Samuel Halverson, Fred Hearty, Andrew J. Metcalf, Andrew Monson, Lawrence W. Ramsey, Paul Robertson, Arpita Roy, Christian Schwab

    We confirm the planetary nature of TOI-1728b using a combination of ground-based photometry, near-infrared Doppler velocimetry and spectroscopy with the Habitable-zone Planet Finder. TOI-1728 is an old, inactive M0 star with T eff = ##IMG## [http://ej.iop.org/images/0004-637X/899/1/29/apjaba0a2ieqn1.gif] {${3980}_{-32}^{+31}$} K, which hosts a transiting super-Neptune at an orbital period of ∼3.49

    更新日期:2020-08-10
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