Author Correction: The distribution and lifetime of powerful radio galaxies as a function of environment and redshift.

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The distribution and lifetime of powerful radio galaxies as a function of environment and redshift.

Correlations between jet power and active time for z < 0.1 high excitation and low excitation radio galaxies are explored as well as evidence in favor of a specific, non-random distribution for these objects including mid-infrared emitting radio galaxies as a function of environment and redshift. In addition, so-called weak line radio galaxies with FRII jet morphology have been identified as a class of active galaxies in the process of shutting down.