Computer Science
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8338l&link_type=abstract
HST Proposal ID #8338
Computer Science
Hst Proposal Id #8338 Agn Hosts And Environment
Scientific paper
The co-moving space density of highly luminous AGN has decreased by roughly 3 orders of magnitude from z=2-3 to the current epoch. To enhance our understanding of this ``mass extinction'' of luminous AGN, we propose to conduct a broad- band imaging survey, using the WFPC2, of 20 radio galaxies with a large range of redshifts { 0.3 to 3}, and radio powers and morphologies, selected from a complete sample of radio sources. Continuum filters are chosen such that galaxies at all redshifts are imaged at constant rest-wavelength near 2200Angstrom, in a region free of strong emission lines. Imaging of this type over such a wide range of redshifts has never been attempted before. These data will allow us to study the properties and evolution of radio galaxies at uniform wavelength over look-back times of 25 to 85 the universe. Our recent studies of a similarly selected sample of radio-loud quasar hosts have shown that the rest-frame UV luminosities of the host galaxies increase by about a factor of 100 between z=0.3 and z=3, and that the higher redshift hosts have larger sizes and more distorted morphologies. A combined data set of radio galaxies and quasars will allow powerful tests of the relationship between radio galaxies and quasars and the evolution of the host galaxies of powerful radio sources over a wide range of look-back times.
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