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Intermittent activity of radio sources. Accretion instabilities and jet precession.

Published online by Cambridge University Press:  24 February 2011

M. Kunert-Bajraszewska ,
A. Janiuk ,
A. Siemiginowska  and
M. Gawroński
M. Kunert-Bajraszewska
Affiliation:
Toruń Centre for Astronomy, N. Copernicus University, Gagarina 11, 87-100 Toruń, Poland email: magda@astro.uni.torun.pl
A. Janiuk
Affiliation:
Center for Theoretical Physics, PAN, Al.Lotnikow 32/46, 02-668 Warsaw, Poland
A. Siemiginowska
Affiliation:
Harvard Smithsonian Center for Astrophysics, 60 Garden St, Cambridge, MA 02138
M. Gawroński
Affiliation:
Toruń Centre for Astronomy, N. Copernicus University, Gagarina 11, 87-100 Toruń, Poland email: magda@astro.uni.torun.pl
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Abstract

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We consider the radiation pressure instability operating on short timescales (103 - 106 years) in the accretion disk around a supermassive black hole as the origin of the intermittent activity of radio sources. We test whether this instability can be responsible for short ages (<104 years) of Compact Steep Spectrum sources measured by hot spots propagation velocities in VLBI observations and statistical overabundance of Gigahertz Peaked Spectrum sources. The implied timescales are consistent with the observed ages of the sources. We aslo discuss possible implications of the intermittent activity on the complex morphology of radio sources, such as the quasar 1045+352, dominated by a knotty jet showing several bends. It is possible that we are whitnessing an ongoing jet precession in this source due to internal instabilities within the jet flow.

Keywords

physical data and processes: accretiongalaxies: evolutionquasars: individual (1045+352)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S275: Jets at all Scales , September 2010 , pp. 180 - 181
Copyright
Copyright © International Astronomical Union 2011

References

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