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501 papers · 1 filter

astro-ph.HE2022★ 4 cited

Bubble in the Whale: Identifying the Optical Counterparts and Extended Nebula for the Ultraluminous X-ray Sources in NGC 4631

Jing Guo, Jianfeng Wu, Hua Feng +9

We present a deep optical imaging campaign on the starburst galaxy NGC 4631 with CFHT/MegaCam. By supplementing the HST/ACS and Chandra/ACIS archival data, we search for the optica…

astro-ph.SR2022★ 6 cited

The deformation of an erupting magnetic flux rope in a confined solar flare

Ruisheng Zheng, Yihan Liu, Liang Zhang +7

Magnetic flux ropes (MFRs), sets of coherently twisted magnetic field lines, are believed as core structures of various solar eruptions. Their evolution plays an important role to…

astro-ph.GA2022★ 38 cited

The Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST) Quasar Survey: Quasar Properties from Data Release Six to Nine

Jun-Jie Jin, Xue-Bing Wu, Yuming Fu +10

We report the fourth installment in the series of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Quasar Survey, which includes quasars observed between Sept…

astro-ph.SR2022★ 4 cited

LAMOST medium-resolution spectroscopic survey of binarity and exotic star (LAMOST-MRS-B): Observation strategy and target selection

Jiao Li, Jiang-Dan Li, Yan-Jun Guo +15

LAMOST-MRS-B is one of the sub-surveys of LAMOST medium-resolution (R~7500) spectroscopic survey. It aims at studying the statistical properties (e.g., binary fraction, orbital per…

astro-ph.HE2022★ 4 cited

Distribution of fast radio burst dispersion measures in CHIME/FRB Catalog 1: implications on the origin of FRBs

Jianwei Zhang, Chengmin Zhang, Di Li +7

Recently, CHIME/FRB project published its first fast radio burst (FRB) catalog (hereafter, Catalog 1), which totally contains 536 unique bursts. With the help of the latest set of…

astro-ph.GA2022★ 3 cited

Rarefied Broad-Line Regions in Active Galactic Nuclei: Anomalous Responses in Reverberation Mapping and Implications for Weak Emission-Line Quasars

Pu Du, Shuo Zhai, Jian-Min Wang

Reverberation mapping (RM) is a widely-used method for probing the physics of broad-line regions (BLRs) in active galactic nuclei (AGNs). There are increasing preliminary evidences…

astro-ph.GA2022★ 24 cited

JCMT BISTRO Observations: Magnetic Field Morphology of Bubbles Associated with NGC 6334

Mehrnoosh Tahani, Pierre Bastien, Ray S. Furuya +142

We study the HII regions associated with the NGC 6334 molecular cloud observed in the sub-millimeter and taken as part of the B-fields In STar-forming Region Observations (BISTRO)…

astro-ph.GA2022★ 80 cited

The Circular Velocity Curve of the Milky Way from 5 to 25 kpc using luminous red giant branch star

Yuan Zhou, Xinyi Li, Yang Huang +1

We present a sample of 254,882 luminous red giant branch (LRGB) stars selected from the APOGEE and LAMOST surveys. By combining photometric and astrometric information from the 2MA…

astro-ph.IM2022★ 10 cited

Galaxy Image Classification using Hierarchical Data Learning with Weighted Sampling and Label Smoothing

Xiaohua Ma, Xiangru Li, Ali Luo +2

With the development of a series of Galaxy sky surveys in recent years, the observations increased rapidly, which makes the research of machine learning methods for galaxy image re…

astro-ph.EP2022★ 8 cited

X-ray morphology due to charge-exchange emissions used to study the global structure around Mars

G. Y. Liang, T. R. Sun, H. Y. Lu +8

Soft x-ray emissions induced by solar wind ions that collide with neutral material in the solar system have been detected around planets, and were proposed as a remote probe for th…

astro-ph.IM2022★ 12 cited

Ultra-Low-Frequency Radio Astronomy Observations from a Selenocentric Orbit: first results of the Longjiang-2 experiment

Jingye Yan, Ji Wu, Leonid I. Gurvits +17

This paper introduces the first results of observations with the Ultra-Long-Wavelength (ULW) -- Low Frequency Interferometer and Spectrometer (LFIS) on board the selenocentric sate…

astro-ph.EP2022★ 23 cited

Hubble WFC3 Spectroscopy of the Terrestrial Planets L~98-59~c \& d: No Evidence for a Clear Hydrogen Dominated Primary Atmosphere

Li Zhou, Bo Ma, Yonghao Wang +1

The nearby bright M-dwarf star L~98-59 has three terrestrial-sized planets. One challenge remaining in characterizing atmospheres around such planets is that it is not known a prio…

astro-ph.GA2022★ 3 cited

Investigating the vertical distribution of the disk as a function of radial action

Yunpeng Jia, Yuqin Chen, Cuihua Du +1

As heating processes can broaden the distributions of radial actions and the vertical distributions of the Galactic disks, we investigate the vertical distribution of the Galactic…

astro-ph.HE2022★ 8 cited

Photometric and Spectroscopic Observations of GRB 210104A: Bright Reverse shock Emission and Dense Circumburst Environment

Lu-Lu Zhang, Li-Ping Xin, Jing Wang +6

Early afterglow observations of gamma-ray bursts (GRBs) are valuable for exploring the properties of their jets and ambient medium. We report our photometric and spectroscopic obse…

astro-ph.GA2022★ 7 cited

NOEMA Detection of Circumnuclear Molecular Gas in X-ray Weak Dual Active Galactic Nuclei: No Evidence for Heavy Obscuration

Meicun Hou, Zhiyuan Li, Xin Liu +5

Dual active galactic nuclei (AGN), which are the manifestation of two actively accreting supermassive black holes (SMBHs) hosted by a pair of merging galaxies, are a unique laborat…

astro-ph.HE2022★ 22 cited

Systematic Broad-band X-ray Study of super-Eddington Accretion onto Supermassive Black Holes. I. X-ray Continuum

Alessia Tortosa, Claudio Ricci, Luis C. Ho +6

We present the first systematic broad-band X-ray study of super-Eddington accretion onto SMBHs with simultaneous {\it NuSTAR} and {\it XMM-Newton} or {\it Swift}/XRT observations o…

astro-ph.HE2022★ 31 cited

Circular Polarization in two Active Repeating Fast Radio Bursts

Yi Feng, Yong-Kun Zhang, Di Li +5

Fast radio bursts (FRBs) are bright millisecond radio bursts at cosmological distances. Only a small fraction of FRBs apparently repeat. Polarization, a fundamental property of ele…

astro-ph.IM2022★ 10 cited

Target Detection Framework for Lobster Eye X-Ray Telescopes with Machine Learning Algorithms

Peng Jia, Wenbo Liu, Yuan Liu +1

Lobster eye telescopes are ideal monitors to detect X-ray transients, because they could observe celestial objects over a wide field of view in X-ray band. However, images obtained…

astro-ph.HE2022★ 11 cited

Exploring the single-pulse behaviours of PSR J0628+0909 with FAST

J. A. Hsu, J. C. Jiang, H. Xu +2

More than 100 rotating radio transients (RRATs) have been discovered since 2006. However, it is unclear whether RRATs radiate in the nulling states. PSR J0628+0909 has been classif…

astro-ph.HE2022★ 18 cited

Evolution of Spin Period and Magnetic Field of the Crab Pulsar: Decay of the Braking Index by the Particle Wind Flow Torque

Cheng-Min Zhang, Xiang-Han Cui, Di Li +8

The evolutions of a neutron star's rotation and magnetic field (B-field) have remained unsolved puzzles for over half a century. We ascribe the rotational braking torques of pulsar…

astro-ph.HE2022★ 6 cited

Using X-ray continuum-fitting to estimate the spin of MAXI J1305-704

Ye Feng, James F. Steiner, Santiago Ubach Ramirez +1

MAXI J1305-704 is a transient X-ray binary with a black hole primary. It was discovered on April 9, 2012, during its only known outburst. MAXI J1305-704 is also a high inclination…

astro-ph.SR2022★ 3 cited

Magnetic outbreak associated with exploding granulations

Chunlan Jin, Guiping Zhou, Guiping Ruan +3

Diagnosing the spatial-temporal pattern of magnetic flux on the Sun is vital for understanding the origin of solar magnetism and activity. Here, we report a new form of flux appear…

astro-ph.SR2022★ 21 cited

On the Nature of the Three-part Structure of Solar Coronal Mass Ejections

Hongqiang Song, Jie Zhang, Leping Li +4

Coronal mass ejections (CMEs) result from eruptions of magnetic flux ropes (MFRs) and can possess a three-part structure in white-light coronagraphs, including a bright front, dark…

astro-ph.SR2022★ 16 cited

Application of a magnetic-field-induced transition in Fe X to solar and stellar coronal magnetic field measurements

Yajie Chen, Wenxian Li, Hui Tian +3

Magnetic fields play a key role in driving a broad range of dynamic phenomena in the atmospheres of the Sun and other stars. Routine and accurate measurements of the magnetic field…