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On the Turbulent ~-Disks and the Intermittent Activity in Active Galactic Nuclei.,
Janiuk, Agnieszka; Czerny, Bozena; Siemiginowska, Aneta;Szczerba Ryszard
2004, ApJ, 602, 595

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Abstract:

We consider effects of MHD turbulence on viscosity during the evolution of the thermal-viscous ionization instability in standard ~-accretion disks. We consider the possibility that accretion onto a supermassive black hole proceeds through an outer standard accretion disk and an inner radiatively inefficient and advection-dominated flow. In this scenario we follow the time evolution of the accretion disk, in which the viscosity parameter ~ is constant throughout the whole instability cycle, as implied by the strength of MHD turbulence. We conclude that the hydrogen ionization instability is a promising mechanism to explain the intermittent activity in AGNs.

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 PDF version  of this paper is available: Janiuk_etal_04.pdf

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