• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-19
Yongming Liang, Nobunari Kashikawa, Zheng Cai, Xiaohui Fan, J. Xavier Prochaska, Kazuhiro Shimasaku, Masayuki Tanaka, Hisakazu Uchiyama, Kei Ito, Rhythm Shimakawa, Kentaro Nagamine, Ikkoh Shimizu, Masafusa Onoue, and Jun Toshikawa

The correlation between neutral hydrogen (H i ) in the intergalactic medium (IGM) and galaxies attracts great interest. We select four fields that include several coherently strong Ly α absorption systems at z ∼ 2.2 detected using background quasars from the whole SDSS/(e) Baryon Oscillation Spectroscopic Survey (BOSS) database. Deep narrowband and g -band imaging are performed using the Hyper Suprime-Cam

更新日期：2021-01-19
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-19
Peixin Zhu, Luis C. Ho, and Hua Gao

The correlation between black hole mass and the stellar mass of the bulge of the host galaxy has attracted much attention ever since its discovery. While traditional investigations of this correlation have treated elliptical galaxies as single, monolithic spheroids, the recent realization that massive elliptical galaxies have undergone significant late-time ( ##IMG## [http://ej.iop.org/images/0004

更新日期：2021-01-19
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-19
Zhenyuan Wang, Yangyao Chen, Yi Mao, Houjun Mo, Huiyuan Wang, Hong Guo, Cheng Li, Jian Fu, Yipeng Jing, Jing Wang, Xiaohu Yang, and Zheng Zheng

The 21 cm intensity mapping experiments promise to obtain the large-scale distribution of H i gas at the post-reionization epoch. In order to reveal the underlying matter density fluctuations from the H i mapping, it is important to understand how H i gas traces the matter density distribution. Both nonlinear halo clustering and nonlinear effects modulating H i gas in halos may determine the scale

更新日期：2021-01-19
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-19
G. L. Israel, M. Burgay, N. Rea, P. Esposito, A. Possenti, S. Dall’Osso, L. Stella, M. Pilia, A. Tiengo, A. Ridnaia, A. Y. Lien, D. D. Frederiks, and F. Bernardini

We report on simultaneous radio and X-ray observations of the radio-emitting magnetar 1E 1547.0–5408 on 2009 January 25 and February 3, with the 64 m Parkes radio telescope and the Chandra and XMM-Newton X-ray observatories. The magnetar was observed in a period of intense X-ray bursting activity and enhanced X-ray emission. We report here on the detection of two radio bursts from 1E 1547.0–5408 reminiscent

更新日期：2021-01-19
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-19
D. van der Vlugt, H. S. B. Algera, J. A. Hodge, M. Novak, J. F. Radcliffe, D. A. Riechers, H. Röttgering, V. Smolčić, and F. Walter

We present ultradeep, matched-resolution Karl G. Jansky Very Large Array observations at 10 and 3 GHz in the COSMOS field: the COSMOS-XS survey. The final 10 and 3 GHz images cover ∼16 and ##IMG## [http://ej.iop.org/images/0004-637X/907/1/5/apjabcaa3ieqn1.gif] {$\sim 180\,{\mathrm{arcmin}}^{2}$} and reach median rms values at the phase center of 0.41 and 0.53 μ Jy beam −1 , respectively. Both images

更新日期：2021-01-19
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-19
V. M. Uritsky, C. E. DeForest, J. T. Karpen, C. R. DeVore, P. Kumar, N. E. Raouafi, and P. F. Wyper

Solar coronal plumes long seemed to possess a simple geometry supporting spatially coherent, stable outflow without significant fine structure. Recent high-resolution observations have challenged this picture by revealing numerous transient, small-scale, collimated outflows (“jetlets”) at the base of plumes. The dynamic filamentary structure of solar plumes above these outflows, and its relationship

更新日期：2021-01-19
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-19
Amit Seta, Luiz Felippe S. Rodrigues, Christoph Federrath, and Christopher A. Hales

Fluctuation dynamos are thought to play an essential role in the evolution of magnetized galaxies, saturating within ∼0.01 Gyr and thus potentially acting as seeds for large-scale mean-field dynamos. However, unambiguous observational confirmation of the fluctuation dynamo action in a galactic environment is still missing. This is because, in spiral galaxies, it is difficult to differentiate between

更新日期：2021-01-19
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-18
Sherry Chhabra, Dale E. Gary, Gregg Hallinan, Marin M. Anderson, Bin Chen, Lincoln J. Greenhill, and Danny C. Price

We present the first results of a solar radio event observed with the Owens Valley Radio Observatory Long Wavelength Array at metric wavelengths. We examine a complex event consisting of multiple radio sources/bursts associated with a fast coronal mass ejection (CME) and an M2.1 GOES soft X-ray flare from 2015 September 20. Images of 9 s cadence are used to analyze the event over a 120 minute period

更新日期：2021-01-19
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-18
Takami Kuroda

We explore the impact of a magnetic field on neutrino–matter interactions in core-collapse supernovae. We first derive the modified source terms for neutrino–nucleon scattering and neutrino absorption and emission processes in the moment formalism. Then, we perform full relativistic, three-dimensional, magnetorotational core-collapse supernova simulations of a ##IMG## [http://ej.iop.org/images/000

更新日期：2021-01-19
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-18
Chengyuan Li, Baitian Tang, Antonino P. Milone, Richard de Grijs, Jongsuk Hong, Yujiao Yang, and Yue Wang

Multiple stellar populations (MPs) with different chemical compositions are not exclusive features of old globular clusters (older than 10 Gyr). Indeed, recent studies reveal that younger clusters (∼2–6 Gyr-old) in the Magellanic Clouds also exhibit star-to-star chemical variations among evolved stars. However, whether MPs are present among less-evolved dwarfs of these intermediate-age clusters is

更新日期：2021-01-19
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-18

The detection of a high-energy neutrino from the flaring blazar TXS 0506+056 and the subsequent discovery of a neutrino excess from the same direction have strengthened the hypothesis that blazars are cosmic neutrino sources. The lack, however, of γ -ray flaring activity during the latter period challenges the standard scenario of correlated γ -ray and high-energy neutrino emission in blazars. We propose

更新日期：2021-01-19
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-18
Yang Wang, Xuan Liu, Weishan Zhu, Lin Tang, and Weipeng Lin

Quenching is a key topic in exploring the formation and evolution of galaxies. In this work, we study the quenching rate, i.e., the variation in the fraction of quenched galaxies per unit time, of the Illustris-1 simulation. By building the quenched fraction function f ( m , ρ , t ) of each snapshot in the simulation, we derive an accurate form of quenching rate as ##IMG## [http://ej.iop.org/image

更新日期：2021-01-19
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-18
A. A. Nucita, F. De Paolis, D. Licchelli, F. Strafella, G. Ingrosso, and M. Maiorano

Intermediate polars are members of the cataclysmic variable binary stars. They are characterized by a moderately magnetized white dwarf accreting matter from a cool main-sequence companion star. In many cases, this accretion gives rise to a detectable X-ray emission. VZ Sex is an interesting X-ray source whose nature needs a robust confirmation. Here, we used archived XMM-Newton observations to assign

更新日期：2021-01-19
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-18
Jiang-Tao Li, Feige Wang, Jinyi Yang, Yuchen Zhang, Yuming Fu, Fuyan Bian, Joel N. Bregman, Xiaohui Fan, Qiong Li, Xue-Bing Wu, and Xiaodi Yu

We report Chandra detection of three UV-bright radio-quiet quasars at z ≳ 5. We have collected a sufficient number of photons to extract an X-ray spectrum of each quasar to measure their basic X-ray properties, such as the X-ray flux, power-law photon index (Γ), and optical-to-X-ray spectral slope ( α OX ). J074749+115352 at z = 5.26 is the X-ray brightest radio-quiet quasar at z > 5. It may have a

更新日期：2021-01-19
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-18
Teaghan O’Briain, Yuan-Sen Ting, Sébastien Fabbro, Kwang M. Yi, Kim Venn, and Spencer Bialek

Advancements in stellar spectroscopy data acquisition have made it necessary to accomplish similar improvements in efficient data analysis techniques. Current automated methods for analyzing spectra are either (a) data driven, which requires prior knowledge of stellar parameters and elemental abundances, or (b) based on theoretical synthetic models that are susceptible to the gap between theory and

更新日期：2021-01-19
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-13
Liang Chen and Bing Zhang

We present an analytical solution of a highly magnetized jet/wind flow. The left side of the general force-free jet/wind equation (the “pulsar” equation) is separated into a rotating and a nonrotating term. The two equations with either term can be solved analytically, and the two solutions match each other very well. Therefore, we obtain a general approximate solution of a magnetically dominated jet/wind

更新日期：2021-01-13
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-13
Travis C. Fischer, Nathan J. Secrest, Megan C. Johnson, Bryan N. Dorland, Phillip J. Cigan, Luis C. Fernandez, Lucas R. Hunt, Michael Koss, Henrique R. Schmitt, and Norbert Zacharias

We present the first results from the Fundamental Reference active galactic nucleus (AGN) Monitoring Experiment, an observational campaign dedicated to understanding the physical processes that affect the apparent positions and morphologies of AGNs. In this work, we obtained simultaneous Swift X-ray Telescope and Very Long Baseline Array (VLBA) radio observations for a snapshot campaign of 25 local

更新日期：2021-01-13
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-13
Wenxiong Li, Xiaofeng Wang, Mattia Bulla, Yen-Chen Pan, Lifan Wang, Jun Mo, Jujia Zhang, Chengyuan Wu, Jicheng Zhang, Tianmeng Zhang, Danfeng Xiang, Han Lin, Hanna Sai, Xinghan Zhang, Zhihao Chen, and Shengyu Yan

We study a sample of 16 Type Ia supernovae (SNe Ia) having both spectroscopic and photometric observations within 2–3 days after the first light. The early B − V colors of such a sample tend to show a continuous distribution. For objects with normal ejecta velocity (NV), theC ii λ 6580 feature is always visible in the early spectra, while it is absent or very weak in the high-velocity (HV) counterpart

更新日期：2021-01-13
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-13
Jonathan Florez, Andreas A. Berlind, Sheila J. Kannappan, David V. Stark, Kathleen D. Eckert, Victor F. Calderon, Amanda J. Moffett, Duncan Campbell, and Manodeep Sinha

We measure the environmental dependence, where environment is defined by the distance to the third nearest neighbor, of multiple galaxy properties inside the Environmental COntext (ECO) catalog. We focus primarily on void galaxies, which we define as the 10% of galaxies having the lowest local density. We compare the properties of void and non-void galaxies: baryonic mass, color, fractional stellar

更新日期：2021-01-13
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-13
Weishan Zhu and Long-Long Feng

We investigate the dispersion measure (DM) and scattering of fast radio bursts (FRBs) by the intergalactic medium (IGM), foreground halos, and host halos using cosmological hydrodynamical simulation. We find that the median DM caused by foreground halos is around 30% of that caused by the IGM, but it has a much larger variance. The DM induced by hosts deviates from a log-normal distribution but exhibits

更新日期：2021-01-13
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-13
K. Bora, R. Bhattacharyya, and P. K. Smolarkiewicz

This work extends the computational model EULAG-MHD to include Hall magnetohydrodynamics (HMHD)—important to explore physical systems undergoing fast magnetic reconnection at the order of the ion inertial length scale. Examples include solar transients along with reconnections in magnetosphere, magnetotail, and laboratory plasmas. The paper documents the results of two distinct sets of implicit large-eddy

更新日期：2021-01-13
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-13
Elaad Applebaum, Alyson M. Brooks, Charlotte R. Christensen, Ferah Munshi, Thomas R. Quinn, Sijing Shen, and Michael Tremmel

We present results from the “Mint” resolution DC Justice League suite of Milky Way–like zoom-in cosmological simulations, which extend our study of nearby galaxies down into the ultrafaint dwarf (UFD) regime for the first time. The mass resolution of these simulations is the highest ever published for cosmological Milky Way zoom-in simulations run to z = 0, with initial star (dark matter) particle

更新日期：2021-01-13
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-13
S. Barsanti, M. S. Owers, R. M. McDermid, K. Bekki, J. Bland-Hawthorn, S. Brough, J. J. Bryant, L. Cortese, S. M. Croom, C. Foster, J. S. Lawrence, Á. R. López-Sánchez, S. Oh, A. S. G. Robotham, N. Scott, S. M. Sweet, and J. van de Sande

We explore stellar population properties separately in the bulge and the disk of double-component cluster galaxies, to shed light on the formation of lenticular galaxies in dense environments. We study eight low-redshift clusters from the Sydney-AAO Multi-object Integral field Galaxy Survey, using two-dimensional photometric bulge–disk decomposition in the g , r , and i bands to characterize galaxies

更新日期：2021-01-13
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-13
Brenna Mockler and Enrico Ramirez-Ruiz

Tidal disruption events (TDEs) offer a unique opportunity to study a single supermassive black hole (SMBH) under feeding conditions that change over timescales of days to months. However, the primary mechanism for generating luminosity during the flares remains debated. Despite the increasing number of observed TDEs, it is unclear whether most of the energy in the initial flare comes from accretion

更新日期：2021-01-13
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-13
Cody Carr, Claudia Scarlata, Alaina Henry, and Nino Panagia

We analyze the spectra of 10 Green Pea galaxies, previously studied by Henry et al., using a semi-analytical line transfer model to interpret emission and absorption features observed in UV galactic spectra. We focus our analysis on various ionization states of silicon, associated with the cool (∼10 4 K) and warm (∼10 5 K) gas. By analyzing low-ionization lines, we study the relationships between the

更新日期：2021-01-13
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-13
Jennifer I-Hsiu Li, Yue Shen, Luis C. Ho, W. N. Brandt, Elena Dalla Bontà, G. Fonseca Alvarez, C. J. Grier, J. V. Hernandez Santisteban, Y. Homayouni, Keith Horne, B. M. Peterson, D. P. Schneider, and Jonathan R. Trump

We present the results of a pilot Hubble Space Telescope (HST) imaging study of the host galaxies of ten quasars from the Sloan Digital Sky Survey Reverberation Mapping (SDSS-RM) project. Probing more than an order of magnitude in black hole (BH) and stellar masses, our sample is the first statistical sample to study the BH–host correlations beyond z > 0.3 with reliable BH masses from reverberation

更新日期：2021-01-13
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-13
Vsevolod Nedora, Sebastiano Bernuzzi, David Radice, Boris Daszuta, Andrea Endrizzi, Albino Perego, Aviral Prakash, Mohammadtaher Safarzadeh, Federico Schianchi, and Domenico Logoteta

We present a systematic numerical relativity study of the dynamical ejecta, winds, and nucleosynthesis in neutron star (NS) merger remnants. Binaries with the chirp mass compatible with GW170817, different mass ratios, and five microphysical equations of state (EOSs) are simulated with an approximate neutrino transport and a subgrid model for magnetohydrodynamic turbulence up to 100 ms postmerger.

更新日期：2021-01-13
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-12
Georgios Chintzoglou, Bart De Pontieu, Juan Martínez-Sykora, Viggo Hansteen, Jaime Cruz de la Rodríguez, Mikolaj Szydlarski, Shahin Jafarzadeh, Sven Wedemeyer, Timothy S. Bastian, and Alberto Sainz Dalda

We present observations of the solar chromosphere obtained simultaneously with the Atacama Large Millimeter/submillimeter Array (ALMA) and the Interface Region Imaging Spectrograph. The observatories targeted a chromospheric plage region of which the spatial distribution (split between strongly and weakly magnetized regions) allowed the study of linear-like structures in isolation, free of contamination

更新日期：2021-01-12
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-12
Jongho Park, Do-Young Byun, Keiichi Asada, and Youngjoo Yun

We present the Generalized Polarization CALibration pipeline (GPCAL), an automated pipeline for instrumental polarization calibration of very long baseline interferometry (VLBI) data. The pipeline is designed to achieve a high calibration accuracy by means of fitting the instrumental polarization model, including the second-order terms, to data from multiple calibrator sources simultaneously. It also

更新日期：2021-01-12
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-12
Gilles Ferrand, Donald C. Warren, Masaomi Ono, Shigehiro Nagataki, Friedrich K. Röpke, Ivo R. Seitenzahl, Florian Lach, Hiroyoshi Iwasaki, and Toshiki Sato

Progress in the three-dimensional modeling of supernovae (SNe) prompts us to revisit the supernova remnant (SNR) phase. We continue our study of the imprint of a thermonuclear explosion on the SNR it produces, which we started with a delayed detonation model of a Chandrasekhar-mass white dwarf. Here we compare two different types of explosion models, each with two variants: two delayed detonation models

更新日期：2021-01-12
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-12
Georgios Chintzoglou, Bart De Pontieu, Juan Martínez-Sykora, Viggo Hansteen, Jaime de la Cruz Rodríguez, Mikolaj Szydlarski, Shahin Jafarzadeh, Sven Wedemeyer, Timothy S. Bastian, and Alberto Sainz Dalda

We propose and employ a novel empirical method for determining chromospheric plage regions, which seems to better isolate a plage from its surrounding regions than other methods commonly used. We caution that isolating a plage from its immediate surroundings must be done with care in order to successfully mitigate statistical biases that, for instance, can impact quantitative comparisons between different

更新日期：2021-01-12
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-12
Krista Lynne Smith, Celia R. Tandon, and Robert V. Wagoner

We compile observations of high-frequency quasi-periodic oscillations (QPOs) around black holes, both stellar and supermassive, and compare their positions in the parameter space of black hole mass, spin, and oscillation frequency. We find that supermassive black holes occupy a separate region of parameter space than stellar, and further, that QPOs seen around tidal disruption events rather than Seyfert-type

更新日期：2021-01-12
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-12
Joy S. Nichols, Yaël Nazé, David P. Huenemoerder, Anthony F. J. Moffat, Nathan A. Miller, Jennifer Lauer, Richard Ignace, Ken Gayley, Tahina Ramiaramanantsoa, Lidia Oskinova, Wolf-Rainer Hamann, Noel D. Richardson, Wayne L. Waldron, and Matthew Dahmer

Analysis of the recent long exposure Chandra X-ray observation of the early-type O star ζ Pup shows clear variability with a period previously reported in optical photometric studies. These 813 ks of HETGS observations taken over a roughly one-year time span have two signals of periodic variability: (1) a high-significance period of 1.7820 ± 0.0008 day, and (2) a marginal detection of periodic behavior

更新日期：2021-01-12
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-12
Y. L. Zhu, K. A. Lund, J. Barnes, T. M. Sprouse, N. Vassh, G. C. McLaughlin, M. R. Mumpower, and R. Surman

The mergers of binary neutron stars, as well as black hole–neutron star systems, are expected to produce an electromagnetic counterpart that can be analyzed to infer the element synthesis that occurred in these events. We investigate one source of uncertainties pertinent to lanthanide-rich outflows: the nuclear inputs to rapid neutron capture nucleosynthesis calculations. We begin by examining 32 different

更新日期：2021-01-12
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-12
Alessandro Peca, Cristian Vignali, Roberto Gilli, Marco Mignoli, Riccardo Nanni, Stefano Marchesi, Micol Bolzonella, Marcella Brusa, Nico Cappelluti, Andrea Comastri, Giorgio Lanzuisi, and Fabio Vito

We present a procedure to constrain the redshifts of obscured ( ##IMG## [http://ej.iop.org/images/0004-637X/906/2/90/apjabc9c7ieqn1.gif] {${N}_{H}\gt {10}^{22}\,{\mathrm{cm}}^{-2}$} ) active galactic nuclei (AGN) based on low count statistics X-ray spectra, which can be adopted when photometric and/or spectroscopic redshifts are unavailable or difficult to obtain. We selected a sample of 54 obscured

更新日期：2021-01-12
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-12
Shoji Ogawa, Yoshihiro Ueda, Atsushi Tanimoto, and Satoshi Yamada

We present the results of a systematic, broadband X-ray spectral analysis of nearby active galactic nuclei (AGNs) with the X-ray clumpy torus model (XCLUMPY). By adding 16 AGNs newly analyzed in this paper, we study a total of 28 AGNs, including unabsorbed and absorbed AGNs taken from Ichikawa et al. and García-Bernete et al. This is the largest sample whose X-ray and infrared spectra are analyzed

更新日期：2021-01-12
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-12
Randall A. Rojas Bolivar, Daniel R. Wik, Simona Giacintucci, Fabio Gastaldello, Allan Hornstrup, Niels-Jorgen Westergaard, and Grzegorz Madejski

Since the first non-thermal reports of inverse Compton (IC) emission from the intracluster medium (ICM) of galaxy clusters at hard X-ray energies, we have yet to unambiguously confirm IC emission in observations with newer facilities. RXTE detected IC emission in one of the hottest known clusters, Abell 2163 (A2163), a massive merging cluster with a giant radio halo—the presumed source of relativistic

更新日期：2021-01-12
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-12
Jianxiong Chen and M.-C. Chu

We have studied the density profile of a dwarf halo in the decaying dark matter (DDM) cosmology, using a new algorithm that resolves halo density profiles down to the innermost 700 pc robustly with high efficiency. Following Schwarzschild’s orbit-based method, we have also developed a simplified model to calculate the DDM halo density profiles, which agree remarkably well with those from N -body simulations

更新日期：2021-01-12
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-12
Sarira Sahu, Carlos E. López Fortín, Luis H. Castañeda Hernández, and Subhash Rajpoot

The high-energy-peaked blazar 1ES 1959+650 is a well-known and well-studied nearby blazar that has undergone several episodes of multi-TeV flaring. In 2002 for the first time an orphan TeV flare was observed from this blazar. During a multiwavelength campaign from 2016 April 29 to November 21, MAGIC telescopes observed multi-TeV flarings during the nights of 2016 June 13 and 14 and July 1 when the

更新日期：2021-01-12
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-11
Timur Takhtaganov, Zarija Lukić, Juliane Müller, and Dmitriy Morozov

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

更新日期：2021-01-12
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-11
M. Domingo, R. Luna, M. Á. Satorre, C. Santonja, and C. Millán

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 .

更新日期：2021-01-12
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-11
E. Dondoglio, A. P. Milone, E. P. Lagioia, A. F. Marino, M. Tailo, G. Cordoni, S. Jang, and M. Carlos

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

更新日期：2021-01-12
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-11
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, and María José Maureira

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

更新日期：2021-01-12
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-11
Jun Dai, Haisheng Ji, Leping Li, Jun Zhang, and Huadong Chen

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

更新日期：2021-01-12
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-11
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

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

更新日期：2021-01-12
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-11
Soshi Okamoto, Yuta Notsu, Hiroyuki Maehara, Kosuke Namekata, Satoshi Honda, Kai Ikuta, Daisaku Nogami, and Kazunari Shibata

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

更新日期：2021-01-12
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-11
Brandon S. Hensley and B. T. Draine

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

更新日期：2021-01-12
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-11
Andrzej A. Zdziarski, Barbara De Marco, Michał Szanecki, Andrzej Niedźwiecki, and Alex Markowitz

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

更新日期：2021-01-12
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-11
Federico Fraternale and Nikolai V. Pogorelov

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

更新日期：2021-01-12
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-11
S. Vasheghani Farahani, S. M. Hejazi, and M. R. Boroomand

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

更新日期：2021-01-12
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-11
Youngdae Lee, Suk Kim, Soo-Chang Rey, and Jiwon Chung

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

更新日期：2021-01-12
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-11
Wanying Kang, Feng Ding, Robin Wordsworth, and Sara Seager

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

更新日期：2021-01-12
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-11
Anshu Kumari, D. E. Morosan, and E. K. J. Kilpua

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

更新日期：2021-01-12
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-11
Zuyi Chen, Guanwen Fang, Zesen Lin, Hongxin Zhang, Guangwen Chen, and Xu Kong

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

更新日期：2021-01-12
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-11
Julio David Melon Fuksman, Hubert Klahr, Mario Flock, and Andrea Mignone

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

更新日期：2021-01-12
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-06
Rui Xue, Ruo-Yu Liu, Ze-Rui Wang, Nan Ding, and Xiang-Yu Wang

In this work, we investigate the 2014–2015 neutrino flare associated with the blazar TXS 0506+056 and a recently discovered muon neutrino event IceCube-200107A in spatial coincidence with the blazar 4FGL J0955.1+3551, under the framework of a two-zone radiation model of blazars where an inner/outer blob close to/far from the supermassive black hole is invoked. An interesting feature that the two sources

更新日期：2021-01-06
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-06
Josiah Schwab

We construct evolutionary models of the remnant of the merger of two carbon-oxygen (CO) core white dwarfs (WDs). With total masses in the range 1–2 M ⊙ , these remnants may either leave behind a single massive WD or undergo a merger-induced collapse to a neutron star (NS). On the way to their final fate, these objects generally experience a ∼10 kyr luminous giant phase, which may be extended if sufficient

更新日期：2021-01-06
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-06
J. M. Joel Ong, Sarbani Basu, and Jean M. McKeever

Localized modeling error in the near-surface layers of evolutionary stellar models causes the frequencies of their normal modes of oscillation to differ from those of actual stars with matching interior structures. These frequency differences are referred to as the asteroseismic surface term. Global stellar properties estimated via detailed constraints on individual mode frequencies have previously

更新日期：2021-01-06
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-06
Ya-Ping Li, Yi-Xian Chen, Douglas N. C. Lin, and Xiaojia Zhang

After protoplanets have acquired sufficient mass to open partial gaps in their natal protostellar disks, residual gas continues to diffuse onto horseshoe streamlines under the effect of viscous dissipation, and to meander in and out of the planets’ Hill sphere. Within the Hill sphere, the horseshoe streamlines intercept gas flow in circumplanetary disks. The host star’s tidal perturbation induces a

更新日期：2021-01-06
• Astrophys. J.  (IF 5.745) Pub Date : 2021-01-06
Z. J. Zhang, K. Yan, C. M. Li, G. Q. Zhang, and F. Y. Wang

Fast radio bursts (FRBs) are millisecond-duration radio transients and can be used as a cosmological probe. However, the dispersion measure (DM) contributed by the intergalactic medium (IGM) is hard to distinguish from other components. In this paper, we use the IllustrisTNG simulation to realistically estimate DM IGM up to z ∼ 9. We find ##IMG## [http://ej.iop.org/images/0004-637X/906/1/49/apjabceb9ieqn1

更新日期：2021-01-06
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