Computer Science
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6776d&link_type=abstract
HST Proposal ID #6776
Computer Science
Hst Proposal Id #6776 Agn
Scientific paper
A clear understanding of the nature of the host galaxies of radio-quiet quasars {RQQs}, radio-loud quasars {RLQs} and radio galaxies {RGs} is of central importance in any attempt to unify and relate the 3 main classes of powerful active galaxies. Current AGN folklore holds that RQQs are found in disc systems, whereas radio-loud objects have spheroidal hosts; meanwhile, the unification of RLQs and RGs via orientation requires that their host galaxies be identical. To test these ideas we have constructed 3 carefully matched samples of RQQs, RLQs and RGs and have being pursuing two complementary ground-based programmes: 2-D modelling of deep K -band images to determine the infrared morphologies and luminosities of the hosts, and off-nuclear optical spectroscopy to determine their star-formation histories. Here we propose to use WFPC2 to determine the optical morphologies and luminosities of the hosts, thus providing the crucial link between our spectroscopic and near-infrared data- sets. Existing HST studies of quasar hosts, whilst producing many interesting new results, have yielded surprisingly little hard information on the properties of the hosts themselves. Our proposed imaging study will remedy this situation by undertaking redder, line-free observations of our three matched AGN samples. This will enable us to perform the first rigorous comparison of the optical-IR colours and morphologies of the hosts of the 3 basic types of powerful AGN, and to build a consistent picture of their star-formation histories.
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