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Episodic ejection from super-massive black holes

Published online by Cambridge University Press:  01 August 2006

Lakshmi Saripalli ,
Ravi Subrahmanyan  and
Richard W. Hunstead
Lakshmi Saripalli
Affiliation:
Raman Research Institute, Bangalore, India email: [email protected], [email protected]
Ravi Subrahmanyan
Affiliation:
Raman Research Institute, Bangalore, India email: [email protected], [email protected]
Richard W. Hunstead
Affiliation:
School of Physics, University of Sydney, Australia email: [email protected]
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Abstract

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Episodic activity in super-massive black holes is shown by radio galaxies exhibiting ‘double-double’ radio morphologies (Subrahmanyan et al. 1996, Schoenmakers et al. 2000). Spectacular examples showing a renewal of beam activity in the form of new beams emerging within relic radio lobes of previous activity have placed the phenomenon of recurrence in AGN outflows on a firm footing.

By using the SUMSS and WENSS GRG samples, we infer that on timescales of order a few million years, low luminosity radio sources are more likely to exhibit episodic behaviour in the accretion on to their supermassive black holes as compared to the more powerful radio galaxies.

Keywords

Galaxiesactive – galaxies: nuclei – accretion
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S238: Black Holes from Stars to Galaxies – Across the Range of Masses , August 2006 , pp. 441 - 442
Copyright
Copyright © International Astronomical Union 2007

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