The duty cycle of local radio galaxies

Details The duty cycle of local radio galaxies The duty cycle of local radio galaxies

2008-05-27

arxiv.org/abs/0805.4152v1

Astronomy and Astrophysics

Astrophysics

accepted for publication in MNRAS; 15 pages, 14 figures

Scientific paper

10.1111/j.1365-2966.2008.13459.x

We use a volume- and flux-limited sample of local ($0.03 \leq z \leq 0.1$) 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 AGN activity to be independent, consistent with these corresponding to different accretion states.

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