Mathematics – Logic
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5995l&link_type=abstract
HST Proposal ID #5995
Mathematics
Logic
Hst Proposal Id #5995 Galaxies &Amp, Clusters
Scientific paper
We are proposing to obtain morphological information on galaxies in two of the highest redshift clusters known at present. The environments of 3C265 (z=0.811) and 3C184 (z=0.996) have been shown by us to contain rich clusters: deep imaging and spectroscopy from the ground show an excess of galaxies, several of them subsequently identified at the same redshift as the radio-galaxy in spectroscopy. The morphological state of galaxies in high redshift clusters should give us important clues about the formation and evolution of galaxies in dense environments and the formation of clusters. The role played by mergers into the observed raise in the blue active fraction of galaxies with redshift (the Butcher-Oemler effect), the location of star forming regions, and the shape of "normal" elliptical and spiral galaxies, and their differences with galaxies in present day clusters, can be ideally assessed from HST imaging with WFPC2. Only a handful of clusters are known at z>0.8, these observations are expected to bring unique clues on the evolution of galaxies in clusters when the universe was 40% of its present age.
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