Mathematics – Logic
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5701c&link_type=abstract
HST Proposal ID #5701
Mathematics
Logic
Hst Proposal Id #5701 Galaxies &Amp, Clusters
Scientific paper
We request WFC time to continue our program of high spatial resolution imagery of the members of southern rich galaxy clusters at intermediate redshifts (z ~ 0.3-0.4) which we have studied extensively at the AAT via fibre-optic spectroscopy and multi-colour photometry. Our comprehensive ground-based data have allowed us to measure precise line indices and colours for individual members in these clusters, thus allowing the construction of a unified picture for the various phenomena associated with the Butcher-Oemler effect whereby galaxies are seen at different stages of star-formation activity within a simple cycle. The WFC data will allow us to further our morphological classification of such galaxies, providing the information crucial to determining the physical phenomena which underlie the Butcher-Oemler effect. The superiority of our cluster samples in terms of the size and completeness of the spectroscopic and photometric coverage from theground makes them ideal targets for tackling this problem with HST.
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