Multiple Explosions and the Evolution of Radio Galaxies

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Abstract
The possibility of sequential explosions in radio galaxies is discussed and it is shown that if multiple explosions do occur, most radio sources will be ejected into a medium which has not recovered from the effects of previous explosions. The most important dynamical effect of previous explosions is the formation of a low density cavity along the axis of the old radio source. This cavity allows ejecta from subsequent explosions to achieve high translational velocities down the channel without suffering significant expansion or radiation losses. The dynamics of secondary sources travelling down such a channel is discussed, and it is shown that such secondary sources achieve their maximum surface brightness and luminosity at the end of the channel when they overtake the primary cloud.

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