WFPC Observations of Distant, X-ray Luminous Clusters of Galaxies

Details WFPC Observations of Distant, X-ray Luminous Clusters of Galaxies WFPC Observations of Distant, X-ray Luminous Clusters of Galaxies

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5987d&link_type=abstract

HST Proposal ID #5987

Computer Science

Hst Proposal Id #5987 Galaxies &Amp, Clusters

Scientific paper

Recent HST WFPC images of distant clusters of galaxies have been spectacular, revealing surprisingly complex galaxy morphologies and a much higher interaction and merger rate compared to present-day clusters. Because these images are exclusively of optically-selected clusters, our view of the z 0.5 Universe may be somewhat biased due to the method of cluster selection. We therefore propose to obtain deep images of three equally distant {z=0.55-0.83} X-ray -selected, X-ray-luminous clusters of galaxies to study their galaxy morphologies and merger/interaction rates. We will compare these clusters with low-z clusters of similar X-ray luminosity and with the distant clusters that HST has already observed. Because our 3 targets are > 5 times more luminous in X-rays and have much denser intracluster gas than the optically-selected clusters already observed, they are directly comparable to nearby clusters with well-developed intracluster media {ICM}. Since ICM evolution plays at least a partial role many models of galaxy evolution, these observations will test those models. Our supplementary ground- based and satellite {ROSAT and ASCA} observations will supply galaxy colors, spectra, velocity dispersions, gas morphology, gas temperatures and metallicities, as well as gas and cluster masses to compare to the HST imaging data.

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