0439086 - ASÚ 2016 RIV NL eng J - Journal Article
Das, T. K. - Nag, S. - Hedge, S. - Bhattacharya, S. - Maity, I. - Czerny, B. - Barai, P. - Wiita, P. J. - Karas, Vladimír - Naskar, T.
Black hole spin dependence of general relativistic multi-transonic accretion close to the horizon.
New Astronomy. Roč. 37, May (2015), s. 81-104. ISSN 1384-1076. E-ISSN 1384-1092
R&D Projects: GA ČR(CZ) GC13-00070J
Institutional support: RVO:67985815
Keywords : black holes * accretion discs
Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics
Impact factor: 1.085, year: 2015

We introduce a novel formalism to investigate the role of the spin angular momentum of astrophysical black holes in influencing the behavior of low angular momentum general relativistic accretion. We propose a metric independent analysis of axisymmetric general relativistic flow, and consequently formulate the space and time dependent equations describing the general relativistic hydrodynamic accretion flow in the Kerr metric. The associated stationary critical solutions for such flow equations are provided and the stability of the stationary transonic configuration is examined using an elegant linear perturbation technique. We examine the properties of infalling material for both prograde and retrograde accretion as a function of the Kerr parameter at extremely close proximity to the event horizon. Our formalism can be used to identify a new spectral signature of black hole spin, and has the potential of performing the black hole shadow imaging corresponding to the low angular momentum accretion flow.
Permanent Link: http://hdl.handle.net/11104/0246928