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. This
paper identifies common features between these seemingly disparate phenomena
described above for the population of radio galaxies, and strings them together
by way of a simple phenomenological framework that has shed light on the radio
loud/radio quiet dichotomy, the jet-disk connection, and the distribution of
all active galaxies as a function of redshift.
