Other
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6720l&link_type=abstract
HST Proposal ID #6720
Other
Hst Proposal Id #6720 Agn
Scientific paper
The first HST results from our cycle 5 mini-survey of a carefully selected sample of radio quasars show dramatic evolution in the morphologies and luminosities of their host galaxies between 0.3 < z < 2.7. Our complete sample is unique in that the quasars span a range of radio properties, are uniformly spread in look-back time, are imaged at the same {2000 Angstrom} restframe, and to approximately the same {observed} limiting surface brightness. We believe that our careful selection is crucial for investigating the properties and evolution of quasar host galaxies and our early results seem to bear this out. In view of the many unknown factors which may govern quasar and quasar-host evolution, and the already clear evidence for strong evolutionary effects {in short, 1 - 2 orbit exposures .}, we propose to complete our original request to observe all 20 quasars from our sample. This will provide us with a sufficient number of quasars to allow some confidence in general conclusions and, in particular, to search for evolutionary differences/connections between the various radio source classes. When compared with the sofar much better studied radio galaxies in other HST programs, we will be able to address the important question of whether radio-loud quasars and radio galaxies are members of the same parent population as is fashionable in the AGN unification schemes, and investigate how the hosts of luminous AGN have evolved over the epochs where luminous quasars have become virtually extinct.
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