Evolutionary Connection of Seyfert Galaxies and Quasars
Various recent data are summarized to yield a local luminosity function for Seyfert 1 galaxies. This luminosity function is evolved in different ways to find fits to other observations of faint, high redshift quasars. It is found that a simple form of pure luminosity evolution, exponential in look-back time, is consistent with all existing data. Extrapolations to redshift 4 and magnitude 26 are given for future tests. It is pointed out that such tests from ground or space must continue to rely on the unresolved quasar. An angular diameter-redshift diagram implies that there is no realistic possibility of detecting galactic envelopes of quasars at high redshift.
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