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The duty cycle of local radio galaxies
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abstract
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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Revisiting Propagation Delays of Ultra-High-Energy Cosmic Rays from Long-lived Sources
Propagation delays of ultra-high-energy cosmic rays in extragalactic magnetic fields can match or exceed AGN duty cycles, weakening the link between detected cosmic rays and their long-lived sources.
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