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From Valera.Suleymanov@ksu.ru Wed Feb 16 10:31:26 2000
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Date: Wed, 16 Feb 2000 10:13:45 +0300
From: Valery Suleymanov
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Dear colleagues,

Thank you so much for invitation to participate in BH-2000
Colloquium. I send you the application of my presentation.
I would like to ask you about travel financial support
(200-300 rub.).

Section: Black Holes in AGN.

Title: Power-law X-ray spectra from accretion \alpha- disc around
supermassive Black Holes.

Institution: Kazan State University

Time: 15 min.

Abstract:

X-ray spectra of AGN and QSO have a power-law shape with a mean
spectral slope close to -0.7 (ranged from -0.3 to -1.1).
It is shown, that accretion \alpha-discs with luminosity close to
Eddington luminosity and \alpha \sim 1 around supermassive black holes
radiate the power-law X-ray spectra with spectral slope in this range.
In inner parts of such discs a viscosity heating is balanced by
Comptonization of own bremsstrahlung radiation of a plasma, and
plasma temperature is 10^7 - 10^9 K. A local spectra (on given radius)
are diluted Wien spectra with corresponding temperature, because
Comptonization parameter y \ge 1. Integral spectra have power-law
shape with mean spectral slope close to -0.7 and high-energy
exponential cutoff. The spectral slope depends on an inclination angle
of a disc to line of sight and a specific angular momentum of a black
hole. The energy of cutoff depends on the relative luminosity of a disc,
the parameter \alpha and a specific angular momentum of a black hole.
Disc models are constructed with General Relativity corrections taken
into consideration, and integral spectra are calculated with Doppler
effect, gravitational redshift and concave of rays taken into
account.



With kind regards, Valery Suleimanov