Evolutionary tracks of FRII sources through the P-D diagram

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Description/Abstract

This is the second in a series of papers presenting an analytical model for the evolution of Fanaroff-Riley II radio sources. In this paper we evaluate the expected radio emission from a radio source incorporating energy-loss processes for the relativistic electrons. By combining these results with our earlier dynamical model, we calculate evolutionary tracks through the power-linear size diagram. These tracks are in good agreement with the observed distribution of sources in this diagram. The effects of different forms for the evolution of the magnetic field in the cocoon, the redshift of the source, the environment of the source, and the defining parameters of the jet are investigated. The evolutionary tracks are found to be insensitive to the assumed form of the magnetic field evolution. Some evidence against protons as a major constituent of the jet material is also found.