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Paper: Recurrent Activity in Radio Galaxies
Volume: 386, Extragalactic Jets: Theory and Observation from Radio to Gamma Ray
Page: 125
Authors: Jamrozy, M.; Konar, C.; Machalski, J.; Mack, K.-H.; Saikia, D.J.; Siemiginowska, A.; Stawarz, L.
Abstract: One of the outstanding issues concerning extragalactic radio sources is the total duration of their active phase and the possible existence of duty cycles of their nuclear activity. A duty cycle can be recognized if there is a mechanism which preserves the information of past activity for a sufficiently long time after a new activity has started up. If a new cycle starts before the radio lobes created during a former activity period have faded, we can recognize this by the observations of a young radio source embedded in an old relic structure.
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