Radio-Quiet Quasar Hosts from z = 0.3 to z = 3

Statistics – Methodology

Scientific paper

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Hst Proposal Id #9214 Agn/Quasars

Scientific paper

Study of the host galaxies and environments of high redshift AGN is proving a valuable, complementary probe of current theories of how galaxies form and evolve. Results from our recent NICMOS imaging program have indicated that the hosts of z 2 - 3 faint radio-quiet quasars have luminosities only around local L_*, making them similar to Lyman-break field galaxies at the same redshifts, and similar to the hosts of low-z radio-quiet quasars with the same nuclear luminosities. These results are consistent with the theoretical predictions of Kauffmann & Haehnelt {2000} for the hierarchical buildup of galaxy hosts and their relation to their resident supermassive black holes. The luminosity of the AGN in these RQQ is key to understanding this relationship, however, and we have so far made only limited studies of the very lowest luminosity objects. In this proposal, we will outline plans for a comprehensive space-based imaging study of the hosts of radio-quiet quasars from low to high z at a range of nuclear luminosities. We will apply a consistent methodology to analyze much of the extensive HST archival imaging data now available. This will allow us to characterize the relationship between nuclear luminosity and host properties, and assess the relationship between nuclear black hole mass and formation epoch.

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