Computer Science
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8194h&link_type=abstract
HST Proposal ID #8194
Computer Science
Hst Proposal Id #8194 Agn Hosts And Environment
Scientific paper
The ROSAT Deep Survey covers an area of 0.3 deg^2 in the direction of the Lockman Hole and has found a source density of 1000 deg^-2 with fluxes above 10^-15 cgs. Spectroscopic identifications of optical counterparts at the Keck telescope are complete to an X-ray flux limit of 2 cdot 10^-15 cgs and optical magnitudes of R<23.5^m. Approximately 70 0.08 to 4.45. This is the highest AGN surface density detected in any waveband. The X-ray luminosity function of AGN shows substantial density evolution, resulting in a significantly larger space density of low-luminosity AGN {mainly Seyferts} in the redshift range 1 < z <2, than expected from the conventional pure luminosity evolution models. We have selected a statistically complete sample of Seyfert galaxies from the ROSAT Deep Survey. The galaxies have a redshift range of 0.9-1.9; this is the most distant available Seyfert sample. We propose to image these objects with broad-band WFPC2 filters in order to investigate the e vo lution of their morphology and e nvironments. The observations will provide insights into the Seyfert phenomenon at intermediate redshift and will complement similar HST studies of normal galaxies, clusters and quasars.
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