A model for variability of AGN

Details A model for variability of AGN A model for variability of AGN

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasp..103..886v&link_type=abstract

(Rice University and University of Texas, Texas-Mexico Conference on Astrophysics: Plasmas in Astrophysics, 3rd, Rice University

Astronomy and Astrophysics

Astrophysics

Accretion Disks, Active Galactic Nuclei, Dynamo Theory, Angular Momentum, Electron Scattering, Radiation Pressure, Variability

Scientific paper

The theory of AGN accretion disks is reviewed to determine a methodology for constructing time-dependent models of the disks which can be compared to observed continuum variations. Angular-momentum transport is identified as a problematic constituent of existing models, and internal waves are proposed as the mechanisms which can drive a dynamo and thereby transport angular momentum in thin, nongravitating Keplerian disks. The model developed predicts that the disks will show limited instabilities over large annuli with frequencies similar to the dynamo-growth rate and the wave-propagation rate.

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