Journal Article

The duty cycle of local radio galaxies

S. S. Shabala, S. Ash, P. Alexander and J. M. Riley

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 388, issue 2, pages 625-637
Published in print August 2008 | ISSN: 0035-8711
Published online July 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13459.x
The duty cycle of local radio galaxies

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We use a volume- and flux-limited sample of local (0.03 ≤z≤ 0.1) radio galaxies with optical counterparts to address the question of how long a typical galaxy spends in radio active and quiescent states. The length of the active phase has a strong dependence on the stellar mass of the host galaxy. Radio sources in the most massive hosts are also retriggered more frequently. The time spent in the active phase has the same dependence on stellar mass as does the gas cooling rate, suggesting the onset of the quiescent phase is due to fuel depletion. We find radio and emission-line active galactic nuclei (AGN) activity to be independent, consistent with these corresponding to different accretion states.

Keywords: galaxies: active; intergalactic medium; galaxies: jets; galaxies: luminosity function, mass function

Journal Article.  8562 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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