Computer Science
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10417f&link_type=abstract
HST Proposal ID #10417
Computer Science
Hst Proposal Id #10417 Agn/Quasars
Scientific paper
The existence of luminous quasars with billion solar mass black holes at high redshift poses important questions about the relation between the formation and evolution of the earliest galaxies and quasars in the universe: how could these high-redshift black holes accrete matter so quickly and so efficiently? Is the quasar phase connected to the formation of galactic bulge in the earliest epoch? Was the black hole-bulge mass relation observed locally already established at high-redshift? We will use ACS/WFC to obtain rest-frame UV imaging of five quasars at z 4 with the highest estimated black hole mass, of the order 10 billion solar masses. The goal of the HST observation is to directly detect their host galaxies and to probe their galactic environment. These quasars are likely among the most massive and luminous host galaxies at high-redshift, providing ideal targets for direct detection. The rest-frame UV properties measured with HST will be combined with rest-frame optical, mid to far-IR oberservations of these quasars to measure the star-formation rate, to estimate the stellar age and mass of the host galaxy, and to probe the quasar/starburst connection, quasar triggering mechanism and relation between black hole and bulge formation at the highest possible redshift. One of the targets, PSS 2322+1944 {z=4.17}, is a gravitational lensed quasar with a nearly complete Einstein ring in CO emission, providing a unique opportunity to study the small scale structure of a high-redshift quasar host galaxy.
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