Other
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5974l&link_type=abstract
HST Proposal ID #5974
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Hst Proposal Id #5974 Quasars
Scientific paper
The co-moving space density of highly luminous quasars has decreased by roughly 3 orders of magnitude from z=2-3 to the current epoch. Understanding the physical processes responsible for this decrease could profoundly influence how we think the universe and galaxies have evolved. We therefore propose to conduct a broad-band imaging survey of the host galaxies of 20 radio-loud quasars over a large redshift range (~0.3 to 2.7) using WFPC2. HST observations are crucial for separating the ``blinding'' nuclear emission (AGN) from that of the extended ``fuzz'' (parent galaxy). The quasars are selected from a complete sample and span a range of radio properties. Filters are chosen such that all the quasars will be imaged at rest-wavelengths near 2000 Angstrom . These data will allow us to study the properties and evolution of quasar host galaxies at constant wavelength over look-back times of 25 to 85% of the age of the universe. When compared with the so far 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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