Imaging a protocluster at z=3.1: Effects of environment and evolution on galaxy populations in the early universe

Details Imaging a protocluster at z=3.1: Effects of environment and evolution on galaxy populations in the early universe Imaging a protocluster at z=3.1: Effects of environment and evolution on galaxy populations in the early universe

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10127m&link_type=abstract

HST Proposal ID #10127

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Hst Proposal Id #10127 Cosmology

Scientific paper

We propose imaging a rich protocluster, 0316-26 at z = 3.13, with 31 confirmed Lya cluster members. The bright radio galaxy host is identified with the progenitor of the dominant cluster galaxy. Because its redshift places Lya into an ACS narrow-band filter, the protocluster provides a unique laboratory for studying galaxies at a crucial epoch in the evolution of the Universe. We shall {i} measure and compare sizes, morphologies and colors of galaxies from populations detected using 4 different selection techniques {Lyman and 4000A breaks, Lya and [OIII] excesses}, {ii} study effects of an overdense environment by comparing the properties of protocluster galaxies with z 3 field galaxies from GOODS, {iii} study effects of evolution by relating our data to observations of similar protocluster/cluster targets at redshifts z = 4.1, 2.2, and 1.2, and {iv} constrain the formation of the most massive cluster galaxies by investigating the spatial distribution, Lya equivalent widths and other properties within the 5" radio galaxy host. The ultimate aim is to disentangle the history of structure development and stellar evolution for rich clusters of galaxies.

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