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Electromagnetic signatures of white dwarf collisions in AGN discs
Shu-Rui Zhang, Yan Luo, Xiao-Jun Wu +3
In the inner region of the disc of an active galactic nucleus (AGN), the collision of two white dwarfs (WDs) through Jacobi capture might be inevitable, leading to a Type Ia supern…
Reprocessing Models for the Optical Light Curves of Hypervariable Quasars from the Sloan Digital Sky Survey Reverberation Mapping Project
Tatsuya Akiba, Jason Dexter, William Brandt +5
We explore reprocessing models for a sample of 17 hypervariable quasars, taken from the Sloan Digital Sky Survey Reverberation Mapping (SDSS-RM) project, which all show coordinated…
Unveiling the small-scale jets in the rapidly growing supermassive black hole IZw1
Xiaolong Yang, Su Yao, Luigi C. Gallo +10
Accretion of black holes at near-Eddington or super-Eddington rates is the most powerful episode that drives black hole growth, and it may work in several types of objects. However…
Comparison of Polarized Radiative Transfer Codes used by the EHT Collaboration
Cora Prather, Jason Dexter, Monika Moscibrodzka +270
Interpretation of resolved polarized images of black holes by the Event Horizon Telescope (EHT) requires predictions of the polarized emission observable by an Earth-based instrume…
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…
Is there a sub-parsec-scale jet base in the nearby dwarf galaxy NGC 4395?
Jun Yang, Xiaolong Yang, Joan M. Wrobel +6
NGC 4395 is a dwarf galaxy at a distance of about 4.3 Mpc (scale: ~0.021 pc mas). It hosts an intermediate-mass black hole (IMBH) with a mass between ~10 and ~10 sol…
Modeling the inner part of M87 jet: confronting jet morphology with theory
Hai Yang, Feng Yuan, Hui Li +5
The formation of jets in black hole accretion systems is a long-standing problem. It has been proposed that a jet can be formed by extracting the rotation energy of the black hole…
The Disk Veiling Effect of the Black Hole Low-Mass X-ray Binary A0620-00
Wan-Min Zheng, Qiaoya Wu, Jianfeng Wu +15
The optical light curves of quiescent black hole low-mass X-ray binaries often exhibit significant non-ellipsoidal variabilities, showing the photospheric radiation of the companio…
Detection of a Parsec-Scale Jet in a Radio-Quiet Narrow-Line Seyfert 1 Galaxy with Highly Accreting Supermassive Black Hole
Su Yao, Xiaolong Yang, Minfeng Gu +7
The jet in active galactic nuclei (AGN) is a key ingredient in understanding the co-evolution of galaxies and their central supermassive black holes (SMBHs). Unfortunately, the mec…
Accretion-modified Stars in Accretion Disks of Active Galactic Nuclei: Gravitational Wave Bursts and Electromagnetic Counterparts from Merging Stellar Black Hole Binaries
Jian-Min Wang, Jun-Rong Liu, Luis C. Ho +2
The recent advanced LIGO/Virgo detections of gravitational waves (GWs) from stellar binary black hole (BBH) mergers, in particular GW190521, which is potentially associated with a…
The Sloan Digital Sky Survey Reverberation Mapping Project: UV-Optical Accretion Disk Measurements with Hubble Space Telescope
Y. Homayouni, Megan R. Sturm, Jonathan R. Trump +10
We present accretion-disk structure measurements from UV-optical reverberation mapping observations of a sample of eight quasars at 0.24<z<0.85. Ultraviolet photometry comes from t…
Accretion-modified Stars in Accretion Disks of Active Galactic Nuclei: Slowly Transient Appearance
Jian-Min Wang, Jun-Rong Liu, Luis C. Ho +1
Compact objects are expected to exist in the accretion disks of supermassive black holes (SMBHs) in active galactic nuclei (AGNs), and in the presence of such a dense environment (…
Binary black hole signatures in polarized light curves
Massimo Dotti, Matteo Bonetti, Daniel J. D'Orazio +2
Variable active galactic nuclei showing periodic light curves have been proposed as massive black hole binary (MBHB) candidates. In such scenarios the periodicity can be due to rel…
Possible Evidence of a Universal Radio/X-ray Correlation in a near-Complete Sample of Hard X-ray Selected Seyfert Galaxies
N. Chang, F. G. Xie, X. Liu +4
Because the disc--jet coupling likely depends on various properties of sources probed, the sample control is always an important but challenging task. In this work, we re-analyzed…
The 450 days X-ray monitoring of the changing-look AGN 1ES 1927+654
C. Ricci, M. Loewenstein, E. Kara +16
1ES 1927+654 is a nearby active galactic nucleus (AGN) which underwent a changing-look event in early 2018, developing prominent broad Balmer lines which were absent in previous ob…
"A more probable explanation" is still impossible to explain GN-z11-flash: in response to Steinhardt et al. (arXiv:2101.12738)
Linhua Jiang, Shu Wang, Bing Zhang +8
In Jiang et al. (2020), we reported a possible bright flash (hereafter GN-z11-flash) from a galaxy GN-z11 at z ~ 11. Recently, Steinhardt et al. (2021; arXiv:2101.12738) found 27 i…
A possible bright ultraviolet flash from a galaxy at redshift z ~ 11
Linhua Jiang, Shu Wang, Bing Zhang +8
In the optical sky, minutes-duration transients from cosmological distances are rare. Known objects that give rise to such transients include gamma-ray bursts (GRBs), the most lumi…
Evidence for GN-z11 as a luminous galaxy at redshift 10.957
Linhua Jiang, Nobunari Kashikawa, Shu Wang +9
GN-z11 was photometrically selected as a luminous star-forming galaxy candidate at redshift z > 10 based on Hubble Space Telescope (HST) imaging data. Follow-up HST near-infrared g…
The Awakening Beast in the Seyfert 1 Galaxy KUG 1141+371 I
Jiachen Jiang, Huaqing Cheng, Luigi C. Gallo +10
KUG 1141+371 is a Seyfert 1 galaxy that shows a simultaneous flux increase in the optical and UV bands in the past decade. For instance, the latest Swift observation in 2019 shows…
The Sloan Digital Sky Survey Reverberation Mapping Project: the XMM-Newton X-ray source catalog and multi-band counterparts
Teng Liu, Andrea Merloni, Torben Simm +10
The XMM-RM project was designed to provide X-ray coverage of the Sloan Digital Sky Survey Reverberation Mapping (SDSS-RM) field. 41 XMM-Newton exposures, placed surrounding the Cha…
Radio activity of supermassive black holes with extremely high accretion rates
Xiaolong Yang, Su Yao, Jun Yang +8
Radio emission from the high- and super-Eddington accreting active galactic nuclei (AGNs) has various origins: a persistent jet, the magnetized corona and the wind-like outflows. I…
Hunting for wandering massive black holes
Minghao Guo, Kohei Inayoshi, Tomonari Michiyama +1
We investigate low-density accretion flows onto massive black holes (BHs) with masses of orbiting around in the outskirts of their host galaxies, performing…
Supermassive black holes with high accretion rates in active galactic nuclei. XI. Accretion disk reverberation mapping of Mrk 142
Edward M. Cackett, Jonathan Gelbord, Yan-Rong Li +15
We performed an intensive accretion disk reverberation mapping campaign on the high accretion rate active galactic nucleus Mrk 142 in early 2019. Mrk 142 was monitored with the Nei…
Measuring black hole masses from tidal disruption events and testing the relation
Z. Q. Zhou, F. K. Liu, S. Komossa +4
Liu and collaborators recently proposed an elliptical accretion disk model for tidal disruption events (TDEs). They showed that the accretion disks of optical/UV TDEs are large and…