Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5978r&link_type=abstract
HST Proposal ID #5978
Astronomy and Astrophysics
Astronomy
Hst Proposal Id #5978 Quasars
Scientific paper
The physical cause of the dramatic evolution in quasar space density is a key problem in extragalactic astronomy. Host galaxy properties provide one of the few observational probes of this evolution. Seeing restricts ground-based studies to redshifts less than about 0.2, well below the rapid rise in space density. We propose to exploit the high spatial resolution of the HST to push studies of quasar host galaxies to redshifts 0.5 < z < 0.65. By concentrating on the steep-spectrum radio-loud population we can eliminate orientation biases, and benefit from clear selection criteria. To decouple redshift and luminosity effects, we will use two complete quasar samples: (i) 3C; and (ii) 7C, from our recently completed ground-based project. Since 3C quasars are 100-times more radio luminous than coeval 7C quasars we can identify trends with radio luminosity at a fixed epoch. Also the 7C quasars have similar radio luminosities to well-studied samples of nearby SSQs, so we can identify trends with epoch at a fixed radio luminosity. Such a study can discriminate between competing theories for quasar evolution, and provides a direct test of schemes for AGN unification.
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