Imaging Clusters of Galaxies at z > 1

Details Imaging Clusters of Galaxies at z > 1 Imaging Clusters of Galaxies at z > 1

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5967d&link_type=abstract

HST Proposal ID #5967

Mathematics

Logic

Hst Proposal Id #5967 Galaxies &Amp, Clusters

Scientific paper

One of the most dramatic achievements of the refurbished HST is its capability for resolving the morphologies of galaxies at high redshift. In Cycle 4, we have obtained an extremely deep image of a rich cluster of galaxies at z=1.206 which surrounds the radio galaxy 3C 324. This observation offers a wealth of morphological data on ``normal'' galaxies at z > 1, many of which appear to be far from normal, at least by z=0 standards. At the same time, despite the early cosmic epoch {30 is a population of apparently ordinary elliptical galaxies already in place, with colors and morphologies very similar to those of their z=0 counterparts. A substantial fraction of early-type cluster galaxies have existed throughout most of a Hubble Time, apparently unaffected by the processes which are driving strong evolution in the population of disk galaxies. We propose to continue this program, imaging two clusters at z=1.140 and 1.169 which span the range of high-z cluster properties. One cluster contains the numerous red galaxies also found around 3C 324, while the other appears to be dominated by blue, presumably star forming galaxies. In addition to extending our knowledge of ``ordinary'' galaxies at z > 1, these observations will provide high-quality data on the remarkably convoluted morphologies exhibited by the radio galaxies themselves at these redshifts.

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