Galaxy Evolution in the Richest Clusters at z=0.8: the EDisCS Cluster Sample

Details Galaxy Evolution in the Richest Clusters at z=0.8: the EDisCS Cluster Sample Galaxy Evolution in the Richest Clusters at z=0.8: the EDisCS Cluster Sample

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9476d&link_type=abstract

HST Proposal ID #9476

Physics

Hst Proposal Id #9476

Scientific paper

The study of distant cluster galaxies requires two key ingredients: {1} deep high-resolution imaging, to constrain galaxy structure; and {2} 8m-class spectroscopy, to measure stellar content, star-formation rates, dynamics, and cluster membership. We will reach both conditions with the addition of HST/ACS imaging to our suite of VLT {36 nights} and NTT {20 nights} observations of 10 confirmed clusters at z 0.8, drawn from the ESO Distant Cluster Survey {EDisCS}. The proposed HST/ACS data will complement our existing optical/IR imaging and spectroscopy with quantitative measures of cluster galaxy morphologies {i.e. sizes and shapes, bulge-disk decompositions, asymmetry parameters}, and with measurements of cluster masses via weak lensing. Major advantages unique to the EDisCS project include: {i} uniform selection of clusters; {ii} large enough sample sizes to characterize the substantial cluster-to-cluster variation in galaxy populations; {iii} large quantities of high quality data from 8m telescopes; {iv} uniform measurements of morphologies, spectroscopic and photometric redshifts, SEDs, star- formation/AGN activities, and internal kinematics; {v} optical selection of clusters to complement the X-ray selection of almost all high-z clusters in the ACS GTO programs; {vi} forefront numerical simulations designed specifically to allow physical interpretation of observed differences between the high-z and local clusters.

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