2D-Simulations of Subcritical and Supercritical Accretion Disks Around Black Holes

2006 ◽  
pp. 259-274
Author(s):  
Toru Okuda
Keyword(s):  
Black Holes ◽  
Accretion Disks ◽  
Supercritical Accretion

scholarly journals Gaseous Disks in the Nuclei of Elliptical Galaxies

1997 ◽  
Vol 163 ◽  
pp. 620-625 ◽  
Author(s):  
H. Ford ◽  
Z. Tsvetanov ◽  
L. Ferrarese ◽  
G. Kriss ◽  
W. Jaffe ◽  
...  
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Angular Momentum ◽  
Accretion Disks ◽  
Large Scale ◽  
Elliptical Galaxies ◽  
Central Mass ◽  
Massive Black Holes ◽  
Radio Jets

AbstractHST images have led to the discovery that small (r ~ 1″ r ~ 100 – 200 pc), well-defined, gaseous disks are common in the nuclei of elliptical galaxies. Measurements of rotational velocities in the disks provide a means to measure the central mass and search for massive black holes in the parent galaxies. The minor axes of these disks are closely aligned with the directions of the large–scale radio jets, suggesting that it is angular momentum of the disk rather than that of the black hole that determines the direction of the radio jets. Because the disks are directly observable, we can study the disks themselves, and investigate important questions which cannot be directly addressed with observations of the smaller and unresolved central accretion disks. In this paper we summarize what has been learned to date in this rapidly unfolding new field.

scholarly journals Coronae above accretion disks around black holes: the effect of Compton cooling

2012 ◽  
Vol 544 ◽  
pp. A87 ◽  
Author(s):  
E. Meyer-Hofmeister ◽  
B. F. Liu ◽  
F. Meyer
Keyword(s):  
Black Holes ◽  
Accretion Disks

scholarly journals 11.18. The magnetic switch and the FR I/FR II break

1998 ◽  
Vol 184 ◽  
pp. 491-492
Author(s):  
D.L. Meier ◽  
P. Godon ◽  
S. Edgington ◽  
D.G. Payne ◽  
K.R. Lind
Keyword(s):  
Black Holes ◽  
Accretion Disks ◽  
Class Ii ◽  
Class I ◽  
Radio Sources ◽  
Magnetic Switch

It is proposed that the Fanaroff and Riley division between class I and class II radio sources may be due to phenomena occurring in the coronae of magnetized accretion disks around black holes.

scholarly journals Symmetry and the Arrow of Time in Theoretical Black Hole Astrophysics

2015 ◽  
Vol 2015 ◽  
pp. 1-5
Author(s):  
David Garofalo
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Active Galactic Nuclei ◽  
Accretion Disks ◽  
Time Reversal ◽  
Large Scale ◽  
Galactic Nuclei ◽  
Arrow Of Time ◽  
Time Symmetry ◽  
The Universe

While the basic laws of physics seem time-reversal invariant, our understanding of the apparent irreversibility of the macroscopic world is well grounded in the notion of entropy. Because astrophysics deals with the largest structures in the Universe, one expects evidence there for the most pronounced entropic arrow of time. However, in recent theoretical astrophysics work it appears possible to identify constructs with time-reversal symmetry, which is puzzling in the large-scale realm especially because it involves the engines of powerful outflows in active galactic nuclei which deal with macroscopic constituents such as accretion disks, magnetic fields, and black holes. Nonetheless, the underlying theoretical structure from which this accreting black hole framework emerges displays a time-symmetric harmonic behavior, a feature reminiscent of basic and simple laws of physics. While we may expect such behavior for classical black holes due to their simplicity, manifestations of such symmetry on the scale of galaxies, instead, surprise. In fact, we identify a parallel between the astrophysical tug-of-war between accretion disks and jets in this model and the time symmetry-breaking of a simple overdamped harmonic oscillator. The validity of these theoretical ideas in combination with this unexpected parallel suggests that black holes are more influential in astrophysics than currently recognized and that black hole astrophysics is a more fundamental discipline.

scholarly journals MAGNETICALLY LEVITATING ACCRETION DISKS AROUND SUPERMASSIVE BLACK HOLES

2012 ◽  
Vol 758 (2) ◽  
pp. 103 ◽  
Author(s):  
Evghenii Gaburov ◽  
Anders Johansen ◽  
Yuri Levin
Keyword(s):  
Black Holes ◽  
Accretion Disks ◽  
Supermassive Black Holes

Magnetic fields of accretion disks and outflows in prograde and retrograde black holes

2013 ◽  
Vol 334 (3) ◽  
pp. 264-267 ◽  
Author(s):  
Yu.N. Gnedin ◽  
M.Yu. Piotrovich ◽  
S.D. Buliga ◽  
T.M. Natsvlishvili
Keyword(s):  
Black Holes ◽  
Magnetic Fields ◽  
Accretion Disks

Dependence of the Spin of Supermassive Black Holes on the Eddington Factor for Accretion Disks in Active Galactic Nuclei

Astrophysics ◽  
2016 ◽  
Vol 59 (4) ◽  
pp. 439-448 ◽  
Author(s):  
M. Yu. Piotrovich ◽  
S. D. Buliga ◽  
Yu. N. Gnedin ◽  
A. G. Mikhailov ◽  
T. M. Natsvlishvili
Keyword(s):  
Black Holes ◽  
Active Galactic Nuclei ◽  
Accretion Disks ◽  
Galactic Nuclei ◽  
Supermassive Black Holes
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