The magnetohydrodynamics of black hole accretion

1986 ◽  
Vol 126 (1) ◽  
pp. 99-104 ◽  
Author(s):  
U. S. Pandey ◽  
G. S. Dubey
Keyword(s):  
Black Hole ◽  
Black Hole Accretion ◽  
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

Hydrodynamics of Black Hole–Accretion Disk Collision

1998 ◽  
Vol 507 (1) ◽  
pp. 131-144 ◽  
Author(s):  
Pavel B. Ivanov ◽  
Igor V. Igumenshchev ◽  
Igor D. Novikov
Keyword(s):  
Black Hole ◽  
Accretion Disk ◽  
Black Hole Accretion ◽  
Black Hole Accretion Disk ◽  
Hole Accretion

scholarly journals The Galaxy Zoo survey for giant AGN-ionized clouds: past and present black hole accretion events

2011 ◽  
Vol 420 (1) ◽  
pp. 878-900 ◽  
Author(s):  
William C. Keel ◽  
S. Drew Chojnowski ◽  
Vardha N. Bennert ◽  
Kevin Schawinski ◽  
Chris J. Lintott ◽  
...  
Keyword(s):  
Black Hole ◽  
Black Hole Accretion ◽  
The Galaxy ◽  
Hole Accretion

scholarly journals Spectral and polarization properties of black hole accretion disc emission: including absorption effects

2020 ◽  
Author(s):  
R Taverna ◽  
L Marra ◽  
S Bianchi ◽  
M Dovčiak ◽  
R Goosmann ◽  
...  
Keyword(s):  
Black Hole ◽  
Polarization State ◽  
General Rule ◽  
Accretion Disc ◽  
Accretion Discs ◽  
Polarization Degree ◽  
Monte Carlo Code ◽  
Black Hole Spin ◽  
Black Hole Accretion ◽  
Hole Accretion

Abstract The study of radiation emitted from black hole accretion discs represents a crucial way to understand the main physical properties of these sources, and in particular the black hole spin. Beside spectral analysis, polarimetry is becoming more and more important, motivated by the development of new techniques which will soon allow to perform measurements also in the X- and γ-rays. Photons emitted from black hole accretion discs in the soft state are indeed expected to be polarized, with an energy dependence which can provide an estimate of the black hole spin. Calculations performed so far, however, considered scattering as the only process to determine the polarization state of the emitted radiation, implicitly assuming that the temperatures involved are such that material in the disc is entirely ionized. In this work we generalize the problem by calculating the ionization structure of a surface layer of the disc with the public code cloudy, and then by determining the polarization properties of the emerging radiation using the Monte Carlo code stokes. This allows us to account for absorption effects alongside scattering ones. We show that including absorption can deeply modify the polarization properties of the emerging radiation with respect to what is obtained in the pure-scattering limit. As a general rule, we find that the polarization degree is larger when absorption is more important, which occurs e.g. for low accretion rates and/or spins when the ionization of the matter in the innermost accretion disc regions is far from complete.

scholarly journals Black hole accretion discs and screened scalar hair

2016 ◽  
Vol 2016 (10) ◽  
pp. 024-024 ◽  
Author(s):  
Anne-Christine Davis ◽  
Ruth Gregory ◽  
Rahul Jha
Keyword(s):  
Black Hole ◽  
Accretion Discs ◽  
Black Hole Accretion ◽  
Scalar Hair ◽  
Hole Accretion
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