NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-26 T06:15:45 PDT
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For refcode 2009ApJ...698..840C:
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Copyright by American Astronomical Society. Reproduced by permission
2009ApJ...698..840C Accretion Disk Model of Short-Timescale Intermittent Activity in Young Radio Sources Czerny, Bozena; Siemiginowska, Aneta; Janiuk, Agnieszka; Nikiel-Wroczynski, Blazej; Stawarz, Lukasz Abstract. We associate the existence of short-lived compact radio sources with the intermittent activity of the central engine caused by a radiation pressure instability within an accretion disk. Such objects may constitute a numerous subclass of gigahertz-peaked spectrum sources, in accordance with the population studies of radio-loud active galaxies, as well as detailed investigations of their radio morphologies. We perform the model computations assuming the viscosity parameterization as proportional to a geometrical mean of the total and gas pressure. The implied timescales are consistent with the observed ages of the sources. The duration of an active phase for a moderate accretion rate is short enough (less than 10^3^-10^4^ yr) that the ejecta are confined within the host galaxy and thus these sources cannot evolve into large size radio galaxies unless they are close to the Eddington limit. Key words: accretion, accretion disks, galaxies: active, instabilities
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