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Abstract
Theoretical models developed to explain the high luminosity of AGN are discussed, reviewing the results of recent investigations. It is pointed out that, whereas most models involve a central supermassive black hole accreting matter from the surrounding medium, various hypotheses as to the nature of the accreted material have been proposed. Consideration is given to nuclear sources (dense central star clusters or the tidal disruption of stars), galactic sources (stellar mass loss or torques in nonaxisymmetric potentials), and extragalactic sources (the infall of intergalactic gas or the accretion of gas-rich dwarfs). A hierarchical framework linking these mechanisms is outlined, and results obtained with the gasdynamic simulation code TREESPH (Hernquist and Katz, 1989) are presented in graphs and briefly characterized. 72 refs.
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