Computer Science
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40387d&link_type=abstract
Spitzer Proposal ID #40387
Computer Science
Scientific paper
We propose 24 um observations of galaxies in 3 rich clusters at 0.33 < z < 0.43. We target large volumes in these clusters --- out to 5 Mpc from the cluster center -- in order to study the star formation history of the infalling galaxies that are building the clusters. Intermediate-redshift clusters are known to include a large population of star-forming galaxies, unlike the passive galaxies of today's clusters. More remarkably, these starforming galaxies are typically star-bursting rather than continuously-star-forming, a behavior driven by either the cluster environment, or by cosmic evolution, or both. The Spitzer MIPS observations are essential for measuring how much star formation is hidden by dust from our optical spectral diagnostics, and especially for identifying true post-starburst galaxies. For the two principal clusters of our proposal, we bring near-complete spectroscopic samples from IMACS/Magellan that provide ~2000 spectra with redshifts per field, ~250 of which are cluster or supercluster members -- the infalling population. The complete sample allows us to compare the cluster/supercluster population with similar ``field'' galaxies -- both isolated and in groups. For these two cluster fields, ~1300 foreground and background galaxies are in the redshift range of interest. These are targets for 24 um measurements as much as the cluster galaxies, since a comparison of similar environments, in the outskirts of clusters and in the true field, will test what effect, if any, the cluster is exerting on star forming history of these galaxies.
Bai Lianfa
Dressler Alan
Oemler Augustus
Rieke George
Rigby Jane
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