Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprn17106b&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
We consider a model of turbulent accretion disks supported by magnetic pressure of turbulent magnetic fields. The turbulent kinetic energy is in equipartition with the turbulent magnetic energy and exceed the thermal energy and radiation energy in the disk. Such supersonic turbulence has a dissipation time of the order of one turnover time of the largest eddy, which is limited by the disk thickness. As a result, the effective alpha in the viscosity law must be of order of unity. The energy dissipated by the turbulence is radiated away from the surface of the disk. We derive the condition for the radiation loss time scale to be short enough to justify the self-consistency of a magnetically dominated thin disk. We calculate the radial structure and emission specta of such a disk. We also discuss the possible origin of the strong field in the context of AGN.
Blackman Eric
Boldyrev Stas
Pariev Vladimir
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