Physics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9138i&link_type=abstract
HST Proposal ID #9138
Physics
Hst Proposal Id #9138 Agn/Quasars
Scientific paper
Imaging studies of quasar host galaxies at high redshift are biased toward detecting luminous hosts. Gravitational lensing combined with optical and near-IR imaging enhances their detectivity and has nearly doubled the number of known hosts at z>1. Lens studies have successfully imaged hosts with lower luminosities {L < L_*}, at farther distances {1 < z < 4}, beneath a larger fraction of quasars than imaging of non- lensed quasars. We propose deep WFPC2 followup imaging of five lensed systems in the F555W and F814W filters, which offer unique opportunities for detailed studies of faint, high-redshift, quasar hosts. This science can not be achieved by imaging of unlensed quasars, or from the ground, because of their small angular sizes. Based on their favorable image geometry, pre-existing near-IR fluxes, and predicted colors, we will detect them with reasonable exposure times. We will measure the colors and luminosities of these 5 quasar hosts in order to study their stellar populations, star formation histories, dust, correlations with properties of the AGN central engine, and black hole growth rate. Resolving the host structure will also help to determine the dark matter distribution of the foreground lens galaxies.
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