Computer Science
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40058r&link_type=abstract
Spitzer Proposal ID #40058
Computer Science
Scientific paper
We propose to study the evolution of star formation in cluster galaxies using a sample that will be arguably the largest and best-studied representative sample of moderate-redshift X-ray clusters for the next decade. The star formation properties of cluster galaxies differ dramatically from field galaxies, but the reasons why remain unclear. Observations of individual clusters suggest that total cluster star formation rates depend on both redshift and cluster mass, but cluster-to-cluster variations are large. To overcome these variations, we propose a survey of clusters from one of the largest area deep X-ray cluster surveys, the 400 square degree survey. We will observe a mass-selected sample of moderate redshift clusters which are being observed in a large (1.8 Msec) Chandra project to probe dark energy. Spitzer observations are critical for measuring optically-obscured star formation, which can be a factor of 10-100 larger than total [OII] SFRs in moderate redshift cluster galaxies. Because clusters are effective gravitational lenses, the IRAC observations can also be used to probe high-redshift galaxies. These Spitzer observations will (1) provide a complete census of SFR in a large X-ray cluster sample, (2) determine the dependence of SFR on both redshift and cluster mass, (3) measure the size of cluster-to-cluster variations in SFR, (4) test the correlations between different tracers of SFR and their evolution, (5) provide important clues to the environmental dependence of star formation in galaxies, and (6) determine the potential impact of cluster galaxy evolution in using clusters as probes of dark energy. Part of this sample was approved in GO2; we propose to complete the sample.
Burenin Rodion
Ebeling Harald
Finn Rose
Hornstrup Allan
Quintana Hernan
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