The Morphological, Photometric, and Spectroscopic Properties of Intermediate Redshift Cluster Galaxies:

Details The Morphological, Photometric, and Spectroscopic Properties of Intermediate Redshift Cluster Galaxies: The Morphological, Photometric, and Spectroscopic Properties of Intermediate Redshift Cluster Galaxies:

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9919f&link_type=abstract

HST Proposal ID #9919

Mathematics

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Hst Proposal Id #9919

Scientific paper

New and fundamental constraints on the evolutionary state of high redshift clusters will be made by obtaining deep, multiband images {SDSS r, i, z} over the central 1.5 Mpc regions of seven distant clusters in the range 0.76 < z < 1.27. The ACS data will allow us to {1} definitively establish the morphological composition and star formation rates as functions of clustercentric radius, local density, x-ray luminosity {obtained from accompanying Chandra, and XMM data}, {2} explore the relationship between substructure, kinematics, and morphology, {3} strongly constrain the galaxy merger frequency and the origins of elliptical and S0 galaxies, {4} measure the mass distribution independently from the light {via gravitational lensing} enabling comparisons with kinematically derived masses, and {5} study the evolution of the structure of the brightest cluster members. The clusters selected for this program already have extensive spectroscopic observations and NIR imaging is either in hand or underway from approved ground based programs. To date, the lower part of this redshift range has only been marginally studied with HST. Our sample includes the two most distant, spectroscopically confirmed superclusters and will significantly increase the baseline over which evolutionary effects can be studied. The data will also be used to identify very high-z galaxies via their unique spectral properties.

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