Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2009-03-23
Astrophys.J.698:840-851,2009
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
35 pages, 8 figures, to appear in ApJ
Scientific paper
10.1088/0004-637X/698/1/840
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 sub-class of Giga-Hertz 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 parametrization 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 (< 10^3-10^4 years) 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.
Czerny Bozena
Janiuk Agnieszka
Nikiel-Wroczynski Blazej
Siemiginowska Aneta
Stawarz Lukasz
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