Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2009-05-14
Int.J.Mod.Phys.D18:1693-1706,2009
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
15 pages, 9 figures, accepted for publication in IJMPD
Scientific paper
10.1142/S0218271809015242
We compute the effects of thermal Comptonization of soft photons emitted from a Kep- lerian disk around a black hole by the post-shock region of a sub-Keplerian flow, known as the CENtrifugal pressure dominated BOundary Layer (CENBOL). We show that the spectral state transitions of black hole candidates could be explained either by varying the outer boundary of the CENBOL, which also happens to be the inner edge of the Keplerian disk, or by changing the central density of the CENBOL which is governed by the rate of the sub-Keplerian flow. We confirm the conclusions of the previous the- oretical studies that the interplay between the intensity of the soft photons emitted by the Keplerian flow and the optical depth and electron temperature of the Comptonizing cloud is responsible for the state transitions in a black hole.
Chakrabarti Sandip K.
Ghosh Himadri
Laurent Philippe
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