Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991cha%26a..15..386y&link_type=abstract
Chinese Astronomy and Astrophysics, Volume 15, Issue 4, p. 386-396.
Astronomy and Astrophysics
Astrophysics
Active Galactic Nuclei-Accretion Disk-Mhd
Scientific paper
By taking magnetic stress in place of viscosity as the mechanism for angular moaentum transfer, the effect of frozen magnetic field on the structure of a geometrically thin accretion disk is examined. It is shown that the disk is quasi-Keplerian and its total luminosity is twice the luminosity in the standard disk model. In the inner region, there exists a narrow cool region and the highly collimated jet is formed under the action of the azimuthal component of the magnetic field. Also, we discuss the possibility that a magnetized corona be formed near the surface of the accretion disk and a wide band radiation issuing therefrom. The model suggested here can easily and reasonably explain the major AGN properties such as the radiation variation, the ``bumps'' in the optical, ultraviolet and soft X-ray ranges, etc.
Wu Xue-Bin
Yang Lan-Tian
Yang P.-B.
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