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Radio Core Size of Low-luminosity Active Galactic Nuclei under the MAD-jet model
Yue Xu, Fu-Guo Xie
After decades of efforts, there are now fruitful high-resolution radio observations of low-luminosity active galactic nuclei (LLAGNs), and the observed frequency has extended from…
Searching for Isolated Black Hole Candidates within 15 pc of the Solar System in Gaia DR3
Abdurakhmon Nosirov, Cosimo Bambi, Leda Gao +4
Theoretical models predict that the Galaxy hosts - black holes formed from the complete gravitational collapse of heavy stars and that most of these black holes are iso…
Comparing observed properties of winds in low-luminosity active galactic nuclei with theoretical predictions
Fangzheng Shi, Feng Yuan, Francesco Tombesi +1
Theoretical and numerical simulations of black hole hot accretion flows have shown the ubiquitous existence of winds and predicted their properties such as velocity and mass flux.…
The width-flux relation of the broad iron line during the state transition of the black hole X-ray binaries
Hang-Ying Shui, Fu-Guo Xie, Zhen Yan +1
The observation of varying broad iron lines during the state transition of the black hole X-ray binaries (BHXBs) have been accumulating.In this work, the relation between the norma…
The X-ray variation of M81* resolved by Chandra and NuSTAR
S. Niu, F. G. Xie, Q. D. Wang +3
Despite advances in our understanding of low luminosity active galactic nuclei (LLAGNs), the fundamental details about the mechanisms of radiation and flare/outburst in hot accreti…
Observational Constraints on Direct Electron Heating in the Hot Accretion Flows in Sgr A* and M87*
Fu-Guo Xie, Ramesh Narayan, Feng Yuan
An important parameter in the theory of hot accretion flows around black holes is , which describes the fraction of ``viscously'' dissipated energy in the accretion flow that go…
Explaining the 'outliers' track in Black Hole X-ray Binaries with the BZ-jet and inner-disk coupling
Ning Chang, Xiang Liu, Fu-Guo Xie +2
In this paper, we investigate the black hole (BH) spin contribution to jet power, especially for the magnetic arrested disk (MAD), where only inner accretion disk luminosity is clo…
Improved model of X-ray emission from hot accretion flows
Andrzej Niedźwiecki, Michał Szanecki, Andrzej A. Zdziarski +1
We have developed an improved model of X-ray emission from optically thin, two-temperature accretion flows, \texttt{kerrflow}, using an exact Monte Carlo treatment of global Compto…
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…
X-ray flares from the stellar tidal disruption by a candidate supermassive black hole binary
Xinwen Shu, Wenjie Zhang, Shuo Li +8
Optical transient surveys have led to the discovery of dozens of stellar tidal disruption events (TDEs) by massive black hole in the centers of galaxies. Despite extensive searches…
Discovery of oscillations above 200 keV in a black hole X-ray binary with Insight-HXMT
Xiang Ma, Lian Tao, Shuang-Nan Zhang +119
Low-frequency quasi-periodic oscillations (LFQPOs) are commonly found in black hole X-ray binaries, and their origin is still under debate. The properties of LFQPOs at high energie…
Coronal properties of black hole X-ray binaries in the hard state as seen by NuSTAR and Swift
Zhen Yan, Fu-guo Xie, Wenda Zhang
In this work, we measure two important phenomenological parameters of corona (and hot accretion flow) in black hole X-ray binaries: the photon index and the electron temperatur…
Radiative Properties of Magnetically-Arrested Disks
Fu-Guo Xie, Andrzej A. Zdziarski
Magnetically-arrested disks (MADs) appear when accretion flows are supplied with a sufficient amount of magnetic flux. In this work, we use results of magnetohydrodynamic simulatio…
Radio/X-ray Correlation in the Mini-Outburts of Black Hole X-ray Transient GRS 1739--278
Fu-Guo Xie, Zhen Yan, Zhongzu Wu
We present quasi-simultaneous radio and X-ray observations of the black hole X-ray binary GRS 1739--278 of its 2015-2016 mini-outbursts, i.e. between 2015 June 10 and 2016 October…
Resolving accretion flows in nearby active galactic nuclei with the Event Horizon Telescope
Bidisha Bandyopadhyay, Fu-Guo Xie, Neil M. Nagar +5
The Event Horizon Telescope (EHT), now with its first ever image of the photon ring around the supermassive black hole of M87, provides a unique opportunity to probe the physics of…
Accretion models for LLAGNs: Model Parameter Estimation and Prediction of their Detectibility
Bidisha Bandyopadhyay, Dominik R. G. Schleicher, Neil Nagar +2
The Event Horizon Telescope (EHT) provides a unique opportunity to probe the physics of supermassive black holes through Very Large Baseline Interferometry (VLBI), such as the exis…
Circumbinary discs around merging stellar-mass black holes
Rebecca G. Martin, Chris Nixon, Fu-Guo Xie +1
A circumbinary disc around a pair of merging stellar-mass black holes may be shocked and heated during the recoil of the merged hole, causing a near-simultaneous electromagnetic co…
Insight-HXMT observations of the New Black Hole Candidate MAXI J1535-571: timing analysis
Y. Huang, J. L. Qu, S. N. Zhang +118
We present the X-ray timing results of the new black hole candidate (BHC) MAXI J1535-571 during its 2017 outburst from Hard X-ray Modulation Telescope (\emph{Insight}-HXMT) observa…
A decades-long fast-rise-exponential-decay flare in low-luminosity AGN NGC 7213
Zhen Yan, Fu-Guo Xie
We analysed the four-decades-long X-ray light curve of the low-luminosity active galactic nucleus (LLAGN) NGC 7213 and discovered a fast-rise-exponential-decay (FRED) pattern, i.e.…
A strong negative correlation between radio loudness and optical-to-X-ray spectral index in low-luminosity AGNs
Shuang-Liang Li, Fu-Guo Xie
It has been argued for years that the accretion mode changes from bright active galactic nuclei (AGNs) to low-luminosity AGNs (LLAGNs) at a rough dividing point of bolometric Eddin…
Radiative heating in the kinetic mode of AGN feedback
Fu-Guo Xie, Feng Yuan, Luis C. Ho
AGN feedback is now widely believed to play a crucial role in the co-evolution between the central black hole and its host galaxy. Two feedback modes have been identified, namely t…
A Monte Carlo Study of the Spectra from Inhomogeneous Accretion Flow
Xiao-Di Yu, Ya-Ping Li, Fu-Guo Xie +1
The model of inhomogeneous accretion flow, in which cold clumps are surrounded by hot gas or corona, has been proposed to explain the spectral features of black hole X-ray binaries…
Fundamental Plane of Black Hole Activity in Quiescent Regime
Fu-Guo Xie, Feng Yuan
A correlation among the radio luminosity (), X-ray luminosity (), and black hole mass () in active galactic nuclei (AGNs) and black hole binaries…
Exploring the accretion model of M87 and 3C 84 with the Faraday rotation measure observations
Ya-Ping Li, Feng Yuan, Fu-Guo Xie
Low-luminosity active galactic nuclei (LLAGNs) are believed to be powered by an accretion-jet model, consisting of an inner advection-dominated accretion flow (ADAF), an outer trun…