Computer Science
Scientific paper
Jun 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010sptz.prop70063h&link_type=abstract
Spitzer Proposal ID #70063
Computer Science
Scientific paper
It is now well-established that mass-selected samples are crucial to understanding the evolution of galaxies at intermediate-high redshift as they transform from starforming galaxies to more quiescent galaxies. Spitzer plays a crucial role in the derivation of such samples. We propose to use IRAC to measure accurate stellar masses of galaxies in our unique spectroscopic and imaging survey of the environs of two forming clusters of galaxies at z~0.8. The evolution of the galaxy stellar mass function is a key prediction of many models of galaxy formation, and various models make different predictions on how much mass assembly occurs for cluster galaxies during the cluster formation process. Our large, low dispersion spectroscopic survey has already yielded a remarkable 20,000 redshifts between z~0 and z~1, including over 2400 at the redshift of our clusters. The proposed IRAC data will provide a measure of the rest-frame, near-infrared flux, and therefore provide accurate stellar mass estimates with which we can study the evolution of the stellar mass function. The proposed wide area will provide us with a field sample at the redshift of the clusters, which will allow us to compare mass functions in different environments. A key aspect of our study is to derive and compare the cluster and group galaxy mass function with the mass function of the field. This very important test will investigate whether the growth of dark matter halos directly influences the growth of the stellar mass of the galaxies in those halos.
Holden Bradford
Illingworth Garth
Kelson Daniel
Patel Shannon
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