Computer Science
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6668d&link_type=abstract
HST Proposal ID #6668
Computer Science
Hst Proposal Id #6668 Cosmology
Scientific paper
Distant rich clusters of galaxies are natural laboratories for studying galaxy evolution because they provide large galaxy samples at fixed redshifts. Spectacular WFPC images of distant clusters of galaxies have revealed surprisingly complex galaxy morphologies and much higher interaction rates than in present-day clusters. We propose to obtain rest-frame U images of three distant {z=0.55-0.83} X-ray-selected, X-ray-luminous clusters of galaxies. With rest-frame B images from Cycle 5, we will be able to derive galaxy colors and color gradients. This data will distinguish young and old stellar populations, resolve galaxy ``train wrecks'', assess the colors of disk and bulges, and distinguish ram-pressure vs. merger induced star formation. We will compare the star formation in these galaxy clusters with that in low-z clusters of similar X-ray luminosity, distant optically-selected clusters, and field galaxies of similar redshift from the Hubble Deep Survey. Since intracluster medium {ICM} evolution plays at le ast a partial role in many models of galaxy evolution, these observations will test those models. Our ground-based and ROSAT and ASCA observations will supply cluster velocity dispersions, ICM morphology, temperatures and metallicities, as well as gas and cluster masses to characterize the intergalactic environment of these distant galaxies. Since at least two of these clusters are lensing background galaxies, these observations will provide morphology and color information for normal galaxies at even higher redshifts.
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