Life on the Edges: Morphological Transformation of Galaxies in Clusters of Galaxies at z=1

Details Life on the Edges: Morphological Transformation of Galaxies in Clusters of Galaxies at z=1 Life on the Edges: Morphological Transformation of Galaxies in Clusters of Galaxies at z=1

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20740h&link_type=abstract

Spitzer Proposal ID #20740

Mathematics

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Scientific paper

Between a redshift of one and today, the mix of morphologies inside clusters of galaxies has changed. Both galaxy-galaxy mergers and passive processes have been proposed to explain this evolution. However, there is ample evidence that at z=1, clusters are still being formed out of infalling groups of galaxies. Therefore, these infalling groups are a likely location for the processes that drive morphological evolution. We propose for 15 by 15 arcminute mosaics using IRAC and MIPS in the vicinity of three z=0.8-0.9 clusters of galaxies. For each cluster, we have some or all of the HST ACS imaging required to measure the distribution of galaxy types and identify merger candidates. Our ongoing program of spectra and ground based imaging will determine the rest-frame optical properties and cluster membership. Spitzer's unique window into the rest-frame near and mid-infrared will allow us to determine accurate stellar mass estimates and star formation rates, even for red galaxies with little optical evidence of any activity. With these data, we will answer the questions: (1) do the infalling galaxies have a sufficient stellar mass to become a typical z=0 cluster galaxy, (2) are the mergers we observe among the infalling galaxies "dry" or are they undergoing massive amounts of star formation, and (3) are the star formation histories of these infalling galaxies consistent with them becoming the massive systems dominated by old stellar populations that we see in clusters of galaxies today?

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