I sat on the (successful and entertaining) thesis defense of Pietro Reviglio (Columbia), who used FIRST, NVSS, and SDSS to investigate the evolution of AGN, and the relationships between radio type and optical spectral type. He finds significant evolution, and some problems for the orientation model for the differences between broad-line and narrow-line AGN. He also finds some evolution in the host galaxy population that is consistent with some structural evolution (as in building bulges from disks), although that conclusion is more speculative, of course.
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