Relativistic Accretion Disk Model of AGNs

Details Relativistic Accretion Disk Model of AGNs Relativistic Accretion Disk Model of AGNs

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...196.6203g&link_type=abstract

American Astronomical Society, 196th AAS Meeting, #62.03; Bulletin of the American Astronomical Society, Vol. 32, p.1284

Astronomy and Astrophysics

Astronomy

Scientific paper

Here we present a new model, based on the modified alpha-accretion disk theory. We have shown that the accretion disk structure in the radiation pressure dominated zone does not depend on the temperature of the plasma. The temperature is defined by the thermal equilibrium equation. Inner part of the high luminosity accretion disk with parameter alpha close to 1 is hot, with temperature ~ 107 - 109 K . In this high temperature region the viscous heating is balanced by the Comptonization of bremsstrahlung radiation of the plasma. The local spectrum of each ring of the disk (we have divided the high temperature region of the disk into 50 rings) is a diluted Wien spectrum, because the Comptonization parameter greater than equal to 1. However, the emergent integral spectrum of the high temperature region is a power-law emission with a high-energy cutoff that depends on the basic parameters of AGNs (the accretion rate, the incidence angle, and the mass and the angular momentum of the central black hole). We have fitted the observed spectra of a few AGNs using the present model. Results of these spectral fitting have been discussed in the framework of the unification model of AGNs.

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