Accretion disk thermal instability in galactic nuclei

摘要: The nonlinear evolution and spatial propagation of the thermal instability in accretion disks galactic nuclei are investigated. Integrations vertical structure described for different alpha prescriptions, stability is examined. Global time-dependent calculations unstable performed which show that there two distinct types behavior according to assumed prescription viscosity parameter: purr type roar type. analyzed some detail. 64 refs.