Convection in radiatively inefficient black hole accretion flows

2001 ◽  
Author(s):  
Igor V. Igumenshchev
Keyword(s):  
Black Hole ◽  
Accretion Flows ◽  
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.

Numerical models of black hole accretion flows

2007 ◽  
Vol 177 (1-2) ◽  
pp. 250-253
Author(s):  
Charles F. Gammie ◽  
Scott Noble ◽  
Po Kin Leung
Keyword(s):  
Black Hole ◽  
Numerical Models ◽  
Accretion Flows ◽  
Black Hole Accretion ◽  
Hole Accretion

scholarly journals The slimming effect of advection on black-hole accretion flows

2016 ◽  
Vol 587 ◽  
pp. A13 ◽  
Author(s):  
J.-P. Lasota ◽  
R. S. S. Vieira ◽  
A. Sadowski ◽  
R. Narayan ◽  
M. A. Abramowicz
Keyword(s):  
Black Hole ◽  
Accretion Flows ◽  
Black Hole Accretion ◽  
Hole Accretion

scholarly journals The Dynamical Structure of Nonradiative Black Hole Accretion Flows

2002 ◽  
Vol 573 (2) ◽  
pp. 738-748 ◽  
Author(s):  
John F. Hawley ◽  
Steven A. Balbus
Keyword(s):  
Black Hole ◽  
Dynamical Structure ◽  
Accretion Flows ◽  
Black Hole Accretion ◽  
Hole Accretion

scholarly journals Radiative, two-temperature simulations of low-luminosity black hole accretion flows in general relativity

2016 ◽  
Vol 466 (1) ◽  
pp. 705-725 ◽  
Author(s):  
Aleksander Sądowski ◽  
Maciek Wielgus ◽  
Ramesh Narayan ◽  
David Abarca ◽  
Jonathan C. McKinney ◽  
...  
Keyword(s):  
General Relativity ◽  
Black Hole ◽  
Accretion Flows ◽  
Black Hole Accretion ◽  
Hole Accretion ◽  
Two Temperature

The effects of Prandtl number on black hole accretion flows

2008 ◽  
Vol 51 (10-12) ◽  
pp. 814-818 ◽  
Author(s):  
Steven A. Balbus ◽  
Pierre Lesaffre
Keyword(s):  
Black Hole ◽  
Prandtl Number ◽  
Accretion Flows ◽  
Black Hole Accretion ◽  
Hole Accretion
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