Probing Low Density Cluster Environments at Moderate-to-High Redshifts

Details Probing Low Density Cluster Environments at Moderate-to-High Redshifts Probing Low Density Cluster Environments at Moderate-to-High Redshifts

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7374r&link_type=abstract

HST Proposal ID #7374

Mathematics

Logic

Hst Proposal Id #7374 Clusters Of Galaxies

Scientific paper

Recent HST WFPC2 images of rich clusters at moderate-to-high redshifts have revealed that morphological information is a crucial ingredient in understanding the physical processes responsible for the evolution of the galaxy population in clusters. However, HST observations have been targeted mostly to optically selected very rich systems or very luminous X-ray selected clusters. Therefore, studies have been made only on very massive, centrally condensed systems which represent only a limited, rare subsample of the cluster population. This may lead to a somewhat distorted view of the observed evolutionary properties. We therefore propose to obtain deep images of 6 clusters extracted from a new, deep X-ray selected sample, at moderate redshift {0.2-0.6} and moderate-low X-ray luminosity, to quantify galaxy morphology and measure the merger/interaction rate in different physical conditions. By combining these observations with those of other clusters that HST has already observed, we will obtain a more meaningful data set covering the complete range of the intracluster medium properties over a substantial look-back time. In addition, complementary ground-based and X-ray observation will provide galaxy colors and spectra, as well as dynamical/thermal state of the intracluster gas and cluster masses. With these essential ingredients we will be able to test models of cluster galaxy evolution and in particular establish the role of environmental effects on the evolution of structure and stellar population.

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