Abstract
Deep optical images have been gathered for a nearly complete sample of radio galaxies from the Revised Third Cambridge (3CR) Catalog in the redshift range 0.15 0.4 supports the hypothesis that some radio-loud quasars may dim with time and evolve into radio galaxies with an e-folding time of ~0.9 Gyr. A compatible scenario is presented for this evolution in which the quasar dims because of the absence of low-velocity interactions between the quasar host and companion galaxies, which trigger quasar activity, and/or a diminishing fuel supply caused by the more effective gas sweeping of a growing intracluster medium.
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