2003/11/01 by Agnieszka Janiuk, Bozena Czerny, Bożena Czerny +2 · 2 citations
Physics and Astronomy · #Astrophysical Phenomena and Observations #Astrophysics and Star Formation Studies #Galaxies: Formation, Evolution, Phenomena #astro-ph
paper · pdf · doi:10.1086/381159
published as Astrophys.J. 602 (2004) 595-602 · 13 pages, 9 figures; ApJ accepted
arxiv created 2003/11/01 · openalex publication_date 2004/02/20 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/31
We consider effects of MHD turbulence on viscosity during the evolution of the thermal-viscous ionization instability in standard α-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 α 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.