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Radiative processes, spectral states and variability of black-hole binaries.

Zdziarski, A. A. and Gierliński, M. (2004) 'Radiative processes, spectral states and variability of black-hole binaries.', Progress of theoretical physics supplement., 155 . pp. 99-119.


We review radiative processes responsible for X-ray emission in hard(low) and soft (high) spectral states of black-hole binaries. The main process in the hard state appears to be scattering of blackbody photons from a cold disk by thermal electrons in a hot inner flow, and any contribution from nonthermal synchrotron emission is at most small. In the soft states, blackbody disk emission dominates energetically, and its high-energy tail is due to scattering by hybrid, thermal/nonthermal electrons, probably in active regions above the disk surface. State transitions appear to correspond to a variable inner radius of the cold disk driven by changes of the accretion rate. The existence of two accretion solutions, hot and cold, in a range of the accretion rate leads to hysteresis in low-mass X-ray binaries.

Item Type:Article
Keywords:Advection-dominated accretion, High-energy spectra, X-ray-emission, Cygnus X-1, Radio galaxies, Line, Nova-muscae-1991, Comptonization, Variability, Reflection.
Full text:Full text not available from this repository.
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Record Created:19 Dec 2006
Last Modified:21 Aug 2009 10:22

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