Thermal and Viscous Instability of Accretion Disc in AGN

2000/08/23 by Agnieszka Janiuk, Janiuk, Agnieszka, B. Czerny +2
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysical Phenomena and Observations #Astrophysics (astro-ph) #FOS: Physical sciences #astro-ph

paper · pdf · doi:10.48550/arxiv.astro-ph/0008356

5 pages, 3 figures; poster presented at Advanced Lectures on Starburst AGN Connection, Mexico, June 2000

arxiv created 2000/08/23 · openalex publication_date 2000/08/23 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The standard accretion discs are known to be thermally and viscously unstable over a certain range of temperatures. In the inner disc regions there may develop radiation pressure driven instability, which is possibly related to the rapid variability detected in AGNs in the UV range. In the outer disc develops the ionization instability, similar to that in the cataclysmic variables, but operating on much longer timescales. Due to this process the spectrum of the accretion disc differs from that of a stationary one.

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