Diagnostics of accretion disc in AGN

Details Diagnostics of accretion disc in AGN Diagnostics of accretion disc in AGN

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..378b&link_type=abstract

In: Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 J

Astronomy and Astrophysics

Astronomy

Dense Stellar Systems

Scientific paper

The active galactic nuclei(AGN)are the most luminous objects in the universe. Total power radiated by an AGN is greater than the total power emitted by all the stars in the host galaxy.The direct diagnostics of the conditions within AGNs come from radiations produced by a wide variety of mechanisms including high energy gamma ray processes atmospheric reprocessing dust emissions and synchrotron radiation. In addition to optical and X-ray photonsthe emssion includes MeV GeV and also TeV gamma rays. We have considered that AGNs are powered by an accretion disc around a supermassive blackhole of 10E+08 solar mass. The structure and heights from the central plane of an accretion disc around such a blackhole depends on the composition of disc materialaccretion rate self gravityand magnetic field in the accreting material. We have considered three types of composition of the disc material: 1.X=0.600;Y=0.380;Z=0.020 2.X=0.700;Y=0.280;Z=0.020 3.X=0..800;Y=0.199;Z=0.001 XYand Z represent hydrogenhelium and metal abundances respectively and the three accretion rates are 0.010.001 0.005 solar mass per year respectively. The result shows that the disc height decreases as the accretion rate decreases.

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