Paper:	A Multifrequency Study of Double-Double Radio Galaxies
Volume:	407, The Low-Frequency Radio Universe
Page:	137
Authors:	Jamrozy, M.; Konar, C.; Saikia, D.J.; Machalski, J.
Abstract:	One of the striking examples of episodic activity in active galactic nuclei are the double-double radio galaxies (DDRGs) with two pairs of oppositely-directed radio lobes from two different cycles of activity. We illustrate, using J1453+3308, a DDRG, as an example, that observations over a wide range of frequencies using both the GMRT and the VLA can be used to determine the spectra of the inner and outer lobes, estimate their spectral ages, estimate the time scales of episodic activity, and examine any difference in the injection spectra in the two cycles of activity. Lowfrequency GMRT observations also suggest that DDRGs and triple-double radio galaxies are rather rare.

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