Other
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5988e&link_type=abstract
HST Proposal ID #5988
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Hst Proposal Id #5988 Quasars
Scientific paper
We propose to obtain WFPC2 images in 2 colors of rich clusters of galaxies associated with quasars. Our extensive surveys of quasar environments suggest that quasars situated in rich clusters evolve 5--6 times more rapidly than those in poor environments. This evolution is mostly likely tied to the evolution of the clusters themselves. Hence, a cluster harboring a bright quasar at its center is likely to be in a relatively early stage of evolution. A detailed study of these clusters would provide important insights into the relationship between environment and quasar activity, and also the evolution of galaxy clusters and their member galaxies. HST images of these clusters, for which we already have extensive redshift data, will address 3 major scientific goals. First, we can study the morphologies of the cluster galaxies and compare their properties with other high redshift clusters. Ground-based data have indicated that these clusters have lower velocity dispersions, higher blue galaxy fractions, and higher merging fractions, and so may represent a unique population of dynamically young galaxy clusters. Second, we will investigate properties of the host galaxies and the local (<25 kpc) environment of the quasars to test scenarios for triggering AGN activity in these environments. This study may also allow us to investigate the origins of cD galaxies, as these are the most likely host galaxies for these quasars.
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