An ACS Treasury Survey of the Coma cluster of galaxies

An ACS Treasury Survey of the Coma cluster of galaxies We propose to use the unique spatial resolution of HST and ACS to construct a Treasury imaging survey of the core and infall region of the richest local cluster, Coma. We will observe samples of thousands of galaxies down to magnitude B=27.3 with the aim of studying in detail the dwarf galaxy population which, according to hierarchical models of galaxy formation, are the earliest galaxies to form in the universe. Our initial scientific objectives are: 1) A study of the structure of the dwarf galaxies, including scaling laws, nuclear structure and morphology, to compare with hierarchical and evolutionary models of their formation. 2) A study of the stellar populations from colors and color gradients, and how the internal chemical evolution of galaxies is affected by interaction with the cluster gaseous and galaxy environment. 3) To determine the effect of the cluster environment upon morphological features, disks, bulges and bars, by comparing these structure in the Coma sample with field galaxy samples. 4) Identification of dwarf galaxy samples for further study with the new generation of multi-object and integral-field spectrographs on 8-10 metre class telescopes such as Keck, Subaru, Gemini, and GTC. This is the first such survey of a nearby rich cluster. It will provide a key database for studies of galaxy formation and evolution, and a very needed reference for comparison with similar galaxy surveys both in lower density environments in the nearby universe, and in high density environments at high redshifts.

This is a test version of the phase II proposal for GO10861. The proposal has been allocated 164 orbits. Mosaic of 7 x 6 tiles in the core of the Coma cluster of galaxies. Each tile to be observed for two orbits in filters F814W and F475W, exact split of time between these filters tbd. It is important that these 84 orbits are at teh same orientation. 40 additional specified positions in the outskirts of the Coma cluster, to be observed for two orbits each, with the same split of time between filters. orientation for these positions is free 12 false 0.0 false false false false false false SUPPORTED CLUSTER OF GALAXIES RICH CLUSTER J2000 00 00 0.0000 +00 00 0.00 J2000 CLUSTER OF GALAXIES RICH CLUSTER J2000 00 00 0.0000 +00 00 0.00 J2000 CLUSTER OF GALAXIES RICH CLUSTER J2000 00 00 0.0000 +00 00 0.00 J2000 CLUSTER OF GALAXIES RICH CLUSTER J2000 00 00 0.0000 +00 00 0.00 J2000 CLUSTER OF GALAXIES RICH CLUSTER J2000 00 00 0.0000 +00 00 0.00 J2000 CLUSTER OF GALAXIES RICH CLUSTER J2000 00 00 0.0000 +00 00 0.00 J2000 CLUSTER OF GALAXIES RICH CLUSTER J2000 00 00 0.0000 +00 00 0.00 J2000 CLUSTER OF GALAXIES RICH CLUSTER J2000 00 00 0.0000 +00 00 0.00 J2000 CLUSTER OF GALAXIES RICH CLUSTER J2000 00 00 0.0000 +00 00 0.00 J2000 CLUSTER OF GALAXIES RICH CLUSTER J2000 00 00 0.0000 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