Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987azh....64...90l&link_type=abstract
Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 64, Jan.-Feb. 1987, p. 90-96. In Russian.
Astronomy and Astrophysics
Astronomy
1
Accretion Disks, Astronomical Models, Black Holes (Astronomy), Magnetic Effects, Magnetic Flux, Energy Dissipation, Optical Thickness, Temperature Effects, X Ray Sources
Scientific paper
The influence of a magnetic field on the structure of accretion disks around black holes is considered. Magnetic field dissipation occurs in different ways depending on whether the radiation pressure (pr) or gas pressure (pg) is predominant in the disk. When pg is much greater than pr, the mechanisms of fast field dissipation are invalid and accretion takes place according to the Pustil'nik-Shvartsman (1974) model of magnetic clot accretion which is characterized by a hard X-ray spectrum. At accretion rates sufficiently high for pr to dominate in the region of primary energy release, the magnetic field dissipates immediately in the disk which, owing to its large optical depth, releases energy at a comparatively low temperature of about 1 keV.
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