scholarly journals Time Variabilities of Optically Thin Black Hole Accretion Disks Reproduced by 3D MHD Simulations

2004 ◽  
Vol 155 ◽  
pp. 371-372 ◽  
Author(s):  
Mami Machida ◽  
Ryoji Matsumoto
Keyword(s):  
Black Hole ◽  
Accretion Disks ◽  
Black Hole Accretion ◽  
Mhd Simulations ◽  
Hole Accretion

scholarly journals Why Have the Observed High-frequency QPOs Not Been Produced by (MHD) Computer Simulations of Black Hole Accretion Disks?

2021 ◽  
Vol 5 (11) ◽  
pp. 274
Author(s):  
Robert V. Wagoner ◽  
Celia R. Tandon
Keyword(s):  
Black Hole ◽  
Computer Simulations ◽  
Accretion Disks ◽  
High Frequency ◽  
Black Hole Accretion ◽  
Mhd Simulations ◽  
Numerical Damping ◽  
Hole Accretion

Abstract We compare some predictions of Wagoner & Tandon (WT) with the results of the hydrodynamic and magnetohydrodynamic (MHD) simulations of Reynolds & Miller (RM). It appears that the MHD simulations were not run for long enough and the numerical damping was not small enough to produce the observed high-frequency QPOs (and the g-mode seen in the hydro simulations).

General relativistic MHD simulations of black hole accretion disks and jets

2007 ◽  
Vol 311 (1-3) ◽  
pp. 117-125 ◽  
Author(s):  
John F. Hawley ◽  
Kris Beckwith ◽  
Julian H. Krolik
Keyword(s):  
Black Hole ◽  
Accretion Disks ◽  
Black Hole Accretion ◽  
Mhd Simulations ◽  
General Relativistic ◽  
Hole Accretion

scholarly journals Global 3D MHD Simulations of Optically Thin Black Hole Accretion Disks

2004 ◽  
Vol 155 ◽  
pp. 124-131
Author(s):  
Ryoji Matsumoto ◽  
Mami Machida ◽  
Kenji Nakamura
Keyword(s):  
Black Hole ◽  
Accretion Disks ◽  
Black Hole Accretion ◽  
Mhd Simulations ◽  
Hole Accretion

Iron Fluorescence from within the Innermost Stable Orbit of Black Hole Accretion Disks

1997 ◽  
Vol 488 (1) ◽  
pp. 109-118 ◽  
Author(s):  
Christopher S. Reynolds ◽  
Mitchell C. Begelman
Keyword(s):  
Black Hole ◽  
Accretion Disks ◽  
Stable Orbit ◽  
Black Hole Accretion ◽  
Hole Accretion

scholarly journals Black Hole Accretion Disks on the Edge

2003 ◽  
Vol 596 (1) ◽  
pp. 414-420 ◽  
Author(s):  
Kristen Menou
Keyword(s):  
Black Hole ◽  
Accretion Disks ◽  
Black Hole Accretion ◽  
Hole Accretion

scholarly journals Low-frequency, one-armed oscillations in black hole accretion flows obtained from direct 3D MHD simulations

2006 ◽  
Vol 2 (S238) ◽  
pp. 405-406
Author(s):  
Mami Machida ◽  
Ryoji Matsumoto
Keyword(s):  
Black Hole ◽  
Low Frequency ◽  
Maximum Velocity ◽  
Relativistic Effects ◽  
Newtonian Potential ◽  
Opening Angle ◽  
Accretion Flows ◽  
Black Hole Accretion ◽  
Mhd Simulations ◽  
Hole Accretion

AbstractWe present the results of global 3D MHD simulations of optically thin black hole accretion flows. The initial disk is embedded in a low density, spherical, isothermal halo and threaded by weak (β ≡ Pgas/Pmag = 100) toroidal magnetic field. General relativistic effects are simulated by using the pseudo-Newtonian potential. When the Maxwell stress in the innermost region of the disk is reduced due to the loss of magnetic flux or by decrease of disk temperature, inner torus is created around 4 – 10rs. We found that in such an inner torus, one-armed (m = 1) density enhancement grows and that the inner torus oscillates quasi-periodically. The oscillation period is about 0.1s when we assume a 10M⊙ black hole. This frequency agrees with the low-frequency QPOs observed in low/hard state of black hole candidates. The disk ejects winds whose opening angle is about 30 degree. The maximum velocity of the wind is about 0.05c.

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