scholarly journals Accretion disk onto boson stars: A way to supplant black hole candidates

2006 ◽  
Vol 73 (2) ◽  
Author(s):  
F. Siddhartha Guzmán
Keyword(s):  
Black Hole ◽  
Accretion Disk ◽  
Boson Stars ◽  
Black Hole Candidates

scholarly journals Modeling the Accretion Disk X‐Ray Continuum of Black Hole Candidates

2007 ◽  
Vol 663 (2) ◽  
pp. 1201-1206 ◽  
Author(s):  
Gabor Pszota ◽  
Wei Cui
Keyword(s):  
Black Hole ◽  
Accretion Disk ◽  
X Ray ◽  
Black Hole Candidates

scholarly journals Accretion Disks in Black Hole Candidates Observed with ASCA

1998 ◽  
Vol 188 ◽  
pp. 135-138
Author(s):  
T. Dotani
Keyword(s):  
Black Hole ◽  
Accretion Disk ◽  
Accretion Disks ◽  
Large Uncertainty ◽  
Soft State ◽  
Hard State ◽  
Black Hole Candidates

Structure of the accretion disk is compared between the soft and hard states of Cyg X-1 using the ASCA data. Large uncertainty of the disk parameters in hard state prevent us from drawing clear conclusion, but the data are consistent with a factor of 3 larger (optically thick) inner disk boundary in the hard state than in the soft state.

scholarly journals X-ray Irradiated Accretion Disk and Bimodal States

1987 ◽  
Vol 125 ◽  
pp. 247-247
Author(s):  
R. Hoshi ◽  
H. Inoue
Keyword(s):  
Black Hole ◽  
Accretion Disk ◽  
Accretion Disks ◽  
Spectroscopic Studies ◽  
X Ray ◽  
Black Hole Candidates

It is well known that black hole candidates, Cyg X-1 and GX 339-4, have distinct high and low states, known as bimodal states. Detailed spectroscopic studies of these X-ray sources have revealed high and low states corresponding to optically thick and thin states of the surrounding accretion disks.

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 A cool accretion disk around the Galactic Centre black hole

Nature ◽  
2019 ◽  
Vol 570 (7759) ◽  
pp. 83-86 ◽  
Author(s):  
Elena M. Murchikova ◽  
E. Sterl Phinney ◽  
Anna Pancoast ◽  
Roger D. Blandford
Keyword(s):  
Black Hole ◽  
Accretion Disk ◽  
Galactic Centre

THE EFFECTS OF DIFFERENT PERTURBATIONS ON THE DYNAMICS OF THE ACCRETION DISK AROUND THE BLACK HOLE

2007 ◽  
Vol 22 (10) ◽  
pp. 1875-1898 ◽  
Author(s):  
ORHAN DÖNMEZ
Keyword(s):  
Shock Wave ◽  
Black Hole ◽  
Shock Waves ◽  
Accretion Disk ◽  
Periodic Oscillation ◽  
Single Star ◽  
Special Cases ◽  
Galactic Black Hole ◽  
General Relativistic ◽  
Armed Spiral

We investigate the special cases of the formation of shocks in the accretion disks around the nonrotating (Schwarzschild) black holes in cases where one or few stars perturb the disk. We model the structure of disk with a 2D fully general relativistic hydrodynamic code and investigate a variety of cases in which the stars interacting with the disk are captured at various locations. We have found the following results: (1) if the stars perturb the disk at nonsymmetric locations, a moving one-armed spiral shock wave is produced and it destroys the disk eventually; (2) if the disk is perturbed by a single star located close to the black hole, a standing shock wave is produced while the disk becomes an accretion tori; (3) if the disk is perturbed by stars at symmetric locations, moving two-armed spiral shock waves are produced while the disk reaches a steady state; (4) continuous injection of matter into the stable disk produces a standing shock wave behind the black hole. Our outcomes reinforce the view that different perturbations on the stable accretion disk carry out different types of shock waves which produce Quasi-Periodic Oscillation (QPO) phenomena in galactic black hole candidates and it is observed as a X-ray.

scholarly journals A good long look at the black hole candidates LMC X-1 and LMC X-3

2001 ◽  
Vol 320 (3) ◽  
pp. 316-326 ◽  
Author(s):  
M. A. Nowak ◽  
J. Wilms ◽  
W. A. Heindl ◽  
K. Pottschmidt ◽  
J. B. Dove ◽  
...  
Keyword(s):  
Black Hole ◽  
Black Hole Candidates

Where Is the Inner Edge of an Accretion Disk around a Black Hole?

2002 ◽  
Vol 573 (2) ◽  
pp. 754-763 ◽  
Author(s):  
Julian H. Krolik ◽  
John F. Hawley
Keyword(s):  
Black Hole ◽  
Accretion Disk
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