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Proceedings of 25th Texas Symposium on Relativistic Astrophysics — PoS(Texas 2010)
There is increasing evidence to suggest that AGN activity may be episodic, with a wide range of possible time scales. Radio galaxies exhibit the most striking examples of episodic activity, with two or three distinct pairs of lobes on opposite sides of the active nucleus. Radio emission from earlier cycles of activity are expected to have steep radio spectra due to radiative losses, and hence be detected more easily at low radio frequencies. Inverse-Compton scattered cosmic microwave backgrounddoi:10.22323/1.123.0014 fatcat:uzkvvwsspzhuzl757td5s7ptkq