Lensed Quasar Hosts at High Redshift

Details Lensed Quasar Hosts at High Redshift Lensed Quasar Hosts at High Redshift

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8268i&link_type=abstract

HST Proposal ID #8268

Physics

Hst Proposal Id #8268 Agn Hosts And Environment

Scientific paper

Gravitational lensing offers a novel way to detect quasar host galaxies at z > 1 and to measure their properties. In lenses, the host galaxy is magnified and stretched, improving the contrast with the quasar point source. We propose deep I-band WFPC2 imaging of five lensed systems {z=1.29, 1.59, 2.32 2.55 and 4.50} where rings and arcs of lensed hosts have been detected with NICMOS, to measure accurately the host colors and luminosities. Preliminary results suggest that the hosts {of radio-quiet quasars} are not very luminous {L < L_*}. Their properties are more consistent with the evolutionary behavior of galaxies built up through continuous star- formation, rather than fully-fledged ellipticals. Even though the sample is small, lensing may offer the best chance to understand the host properties of the bulk of the high redshift quasar population. As a fringe benefit, resolving the host structure will help to determine the dark matter distribution of the foreground lens galaxies.

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