scholarly journals Global Three‐dimensional Magnetohydrodynamic Simulations of Black Hole Accretion Disks: X‐Ray Flares in the Plunging Region

2003 ◽  
Vol 585 (1) ◽  
pp. 429-442 ◽  
Author(s):  
Mami Machida ◽  
Ryoji Matsumoto
Keyword(s):  
Black Hole ◽  
Accretion Disks ◽  
Three Dimensional ◽  
X Ray ◽  
Black Hole Accretion ◽  
Magnetohydrodynamic Simulations ◽  
Hole Accretion

scholarly journals Vacuum birefringence and the x-ray polarization from black-hole accretion disks

2018 ◽  
Vol 97 (8) ◽  
Author(s):  
Ilaria Caiazzo ◽  
Jeremy Heyl
Keyword(s):  
Black Hole ◽  
Accretion Disks ◽  
X Ray ◽  
Black Hole Accretion ◽  
Hole Accretion

scholarly journals High-Frequency QPOs and Overstable Oscillations of Black-Hole Accretion Disks

2012 ◽  
Vol 8 (S290) ◽  
pp. 57-61 ◽  
Author(s):  
Dong Lai ◽  
Wen Fu ◽  
David Tsang ◽  
Jiri Horak ◽  
Cong Yu
Keyword(s):  
Black Hole ◽  
Accretion Disks ◽  
High Frequency ◽  
Oscillation Mode ◽  
Relativistic Effects ◽  
X Ray ◽  
Black Hole Accretion ◽  
General Relativistic ◽  
X Ray Binaries ◽  
Hole Accretion

AbstractThe physical origin of high-frequency QPOs (HFQPOs) in black-hole X-ray binaries remains an enigma despite many years of detailed observational studies. Although there exists a number of models for HFQPOs, many of these are simply “notions” or “concepts” without actual calculation derived from fluid or disk physics. Future progress requires a combination of numerical simulations and semi-analytic studies to extract physical insights. We review recent works on global oscillation modes in black-hole accretion disks, and explain how, with the help of general relativistic effects, the energy stored in the disk differential rotation can be pumped into global spiral density modes in the disk, making these modes grow to large amplitudes under certain conditions (“corotational instability”). These modes are robust in the presence of disk magnetic fields and turbulence. The computed oscillation mode frequencies are largely consistent with the observed values for HFQPOs in BH X-ray binaries. The approximate 2:3 frequency ratio is also expected from this model. The connection of HFQPOs with other disk properties (such as production of episodic jets) is also discussed.

scholarly journals Variability of Black Hole Accretion Disks

1994 ◽  
Vol 159 ◽  
pp. 487-487
Author(s):  
Michael A. Nowak ◽  
Robert V. Wagoner
Keyword(s):  
Black Hole ◽  
Accretion Disks ◽  
Power Spectra ◽  
X Ray ◽  
Black Hole Accretion ◽  
Hole Accretion

We consider two forms of variability in black hole accretion disks: harmonically oscillating modes trapped near the disk inner edge, and noisy fluctuations throughout the entire disk. We apply the former to AGN disks, and the latter to the X-ray power spectra of GX339-4.

scholarly journals X-ray probes of black hole accretion disks for testing the no-hair theorem

2014 ◽  
Vol 90 (6) ◽  
Author(s):  
Tim Johannsen
Keyword(s):  
Black Hole ◽  
Accretion Disks ◽  
X Ray ◽  
Black Hole Accretion ◽  
Hole Accretion

scholarly journals X‐Ray Iron Line Reverberation from Black Hole Accretion Disks

1999 ◽  
Vol 514 (1) ◽  
pp. 164-179 ◽  
Author(s):  
Christopher S. Reynolds ◽  
Andrew J. Young ◽  
Mitchell C. Begelman ◽  
Andrew C. Fabian
Keyword(s):  
Black Hole ◽  
Accretion Disks ◽  
Iron Line ◽  
X Ray ◽  
Black Hole Accretion ◽  
Hole Accretion

scholarly journals Mode Transitions of Black Hole Accretion Disks

2003 ◽  
Vol 214 ◽  
pp. 91-94
Author(s):  
Ju-Fu Lu ◽  
Wei-Min Gu ◽  
Yi-Qing Lin
Keyword(s):  
Black Hole ◽  
Accretion Disks ◽  
Thermal Instability ◽  
Physical Mechanism ◽  
Outer Part ◽  
X Ray ◽  
Black Hole Accretion ◽  
Mode Transitions ◽  
X Ray Binaries ◽  
Hole Accretion

The model of a bimodal accretion disk, which consists of an Shakura-Sunyaev disk (SSD) as the outer part and an advection-dominated accretion flow (ADAF) as the inner part, has been quite successfully applied to many black hole X-ray binaries. However, the precise physical mechanism through which such a transition occurs remains a matter of debate. We review briefly SSD-ADAF transition mechanisms presented in the literature, and offer a proposal that in the case of moderately strong viscosity, the thermal instability of a radiation pressure-supported SSD can trigger the transition.

scholarly journals X-Ray Reverberation from Black Hole Accretion Disks with Realistic Geometric Thickness

2018 ◽  
Vol 868 (2) ◽  
pp. 109 ◽  
Author(s):  
Corbin Taylor ◽  
Christopher S. Reynolds
Keyword(s):  
Black Hole ◽  
Accretion Disks ◽  
X Ray ◽  
Black Hole Accretion ◽  
Hole Accretion ◽  
Geometric Thickness

X-ray observations of black-hole accretion disks

2006 ◽  
Vol 38 (12) ◽  
pp. 2862-2866 ◽  
Author(s):  
Ken Ebisawa ◽  
Toshihiro Kawaguchi
Keyword(s):  
Black Hole ◽  
Accretion Disks ◽  
X Ray ◽  
Black Hole Accretion ◽  
Hole Accretion
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