Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9764b&link_type=abstract
HST Proposal ID #9764
Physics
Hst Proposal Id #9764 Cosmology
Scientific paper
Giant elliptical galaxies offer can some of the tightest constraints on models of galaxy formation. Recent observations have shown significant inconsistencies between their properties and the predictions of the currently popular hierarchical clustering models. Many outstanding questions about the nature and evolution of these objects can best {or only} be addressed by extending studies of cluster ellipticals out to z>1. Recently we have identified large overdensities of red galaxies, strongly clustered around powerful radio sources at z 1.5. We propose to image our two richest fields, of Abell Class 0-1 richness, using the F814W and F606W filters on the ACS/WFC. Our goals are to investigate: {1} Galaxy morphologies: we will determine the bulge fractions of the red cluster galaxies, to confirm that they are early-types, and measure their characteristic radii to investigate their evolutionary status. {2} Colour gradients: we will search for colour gradients indicative of recent star formation {particularly blue cores}, or inhomogeneities in the internal colours which might be indicative of recent assembly. {3} Cluster membership: with two additional colours we will obtain accurate photometric redshift estimates for all galaxies. Combined with studies of nearby clusters and of field ellipticals, our results will place very tight constraints on the formation of the most massive galaxies.
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