scholarly journals Estimation of mass outflow rates from viscous relativistic accretion discs around black holes

2016 ◽  
Vol 459 (4) ◽  
pp. 3792-3811 ◽  
Author(s):  
Indranil Chattopadhyay ◽  
Rajiv Kumar
Keyword(s):  
Black Holes ◽  
Accretion Discs ◽  
Mass Outflow

scholarly journals Simulations of radiation driven winds from Keplerian discs

2020 ◽  
Author(s):  
Sananda Raychaudhuri ◽  
Mukesh K Vyas ◽  
Indranil Chattopadhyay
Keyword(s):  
Black Holes ◽  
Angular Momentum ◽  
Accretion Rate ◽  
Accretion Disc ◽  
Accretion Discs ◽  
Thermal Pressure ◽  
Linear Effect ◽  
Outflow Rate ◽  
Mass Outflow ◽  
Order Of Magnitude

Abstract We study the ejection of winds from thin accretion discs around stellar mass black holes and the time evolution of these winds in presence of radiation field generated by the accretion disc. Winds are produced by radiation, thermal pressure and the centrifugal force of the disc. The winds are found to be mildly relativistic, with speeds reaching up to terminal speeds 0.1 for accretion rate 4 in Eddington units. We show that the ejected matter gets its rotation by transporting angular momentum from the disc to the wind. We also show that the radiation drag affects the accretion disc winds in a very significant manner. Not only that the terminal speeds are reduced by an order of magnitude due to radiation drag, but we also show that the non-linear effect of radiation drag, can mitigate the formation of the winds from the matter ejected by the accretion disc. As radiation drag reduces the velocity of the wind, the mass outflow rate is reduced in its presence as well.

scholarly journals Effective sound speed in relativistic accretion discs around Schwarzschild black holes

New Astronomy ◽  
2019 ◽  
Vol 69 ◽  
pp. 48-57
Author(s):  
Md Arif Shaikh ◽  
Susovan Maity ◽  
Sankhasubhra Nag ◽  
Tapas Kumar Das
Keyword(s):  
Black Holes ◽  
Sound Speed ◽  
Accretion Discs

Astronomy: Black holes, accretion discs and Seyfert galaxies

Nature ◽  
1984 ◽  
Vol 309 (5963) ◽  
pp. 17-18 ◽  
Author(s):  
C. Martin Gaskell
Keyword(s):  
Black Holes ◽  
Seyfert Galaxies ◽  
Accretion Discs

scholarly journals X-Ray Heated Accretion Discs Around Stellar Mass Black Holes

2004 ◽  
Vol 194 ◽  
pp. 200-201
Author(s):  
Ivan Hubeny ◽  
Dayal T. Wickramasinghe
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Vertical Structure ◽  
Black Body ◽  
Incident Radiation ◽  
Accretion Discs ◽  
Distribution Models ◽  
Solar Mass ◽  
X Ray ◽  
Low Mass

We investigate the effects of irradiation on the vertical structure of accretion discs around black holes and its impact on the emergent energy distribution. Models are presented for a 10 Solar mass black hole in a low mass X-ray binary assuming a black body spectrum for the incident radiation. We show that for a disc annulus at a given radius, the spectra become increasingly distorted as the incident flux increases relative to the viscously generated heating flux in the disc. Significant effects are apparent for rings even at distances of ~ 10,000 Schwarzschild radii from the black hole for realistic dilution factors.

scholarly journals Search for wormhole candidates in active galactic nuclei: radiation from colliding accreting flows

2020 ◽  
Vol 498 (3) ◽  
pp. 3684-3686
Author(s):  
M Yu Piotrovich ◽  
S V Krasnikov ◽  
S D Buliga ◽  
T M Natsvlishvili
Keyword(s):  
Black Holes ◽  
Gamma Radiation ◽  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Supermassive Black Holes ◽  
Accretion Discs

ABSTRACT The underlying hypothesis of this work is that the active galactic nuclei (AGNs) are wormhole mouths rather than supermassive black holes. Under some – quite general – assumptions such wormholes may emit gamma radiation as a result of a collision of accreting flows inside the wormholes. This radiation has a distinctive spectrum much different from those of jets or accretion discs of AGNs. An observation of such radiation would serve as evidence of the existence of wormholes.

scholarly journals Humpy LNRF-velocity profiles in accretion discs orbiting rapidly rotating Kerr black holes: a possible relation to epicyclic oscillations

2006 ◽  
Vol 2 (S238) ◽  
pp. 459-460
Author(s):  
Zdeněk Stuchlík ◽  
Petr Slaný ◽  
Gabriel Török
Keyword(s):  
Black Holes ◽  
Velocity Profiles ◽  
Accretion Discs ◽  
Orbital Velocity ◽  
Rotating Frames ◽  
Kerr Black Holes ◽  
Definition Of

AbstractCoordinate-independent definition of the characteristic, so-called “humpy” frequency related to the positive gradient of the orbital velocity in locally non-rotating frames around nearly extreme Kerr black holes is given and compared with the epicyclic and orbital frequencies for both Keplerian thin discs and limiting marginally stable thick discs.

scholarly journals Viscous driving of global oscillations in accretion discs around black holes

2014 ◽  
Vol 446 (1) ◽  
pp. 240-253 ◽  
Author(s):  
Ryan Miranda ◽  
Jiří Horák ◽  
Dong Lai
Keyword(s):  
Black Holes ◽  
Accretion Discs

scholarly journals Energy, momentum and mass outflows and feedback from thick accretion discs around rotating black holes

2013 ◽  
Vol 436 (4) ◽  
pp. 3856-3874 ◽  
Author(s):  
Aleksander Sądowski ◽  
Ramesh Narayan ◽  
Robert Penna ◽  
Yucong Zhu
Keyword(s):  
Black Holes ◽  
Accretion Discs ◽  
Rotating Black Holes
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