Computer Science
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30102f&link_type=abstract
Spitzer Proposal ID #30102
Computer Science
Scientific paper
In dense environments in the local universe, very few galaxies are currently forming stars, while galaxies in less dense environments are undergoing significant star formation. We are studying the star-formation properties of local and distant galaxy clusters in order to understand what causes the environmental variations in galaxy star-formation properties. This proposal targets 9 low-mass clusters at z = 0.5 in order to fill two significant gaps in current Spitzer studies of galaxy clusters. First, we will double the sample of clusters at z = 0.5. Second, our sample contains optically-selected, low-mass clusters, and current Spitzer programs target only the most massive, X-ray selected clusters at this redshift. Cluster star formation properties depend on both cluster mass and redshift. Therefore, one must sample the full range of cluster masses to reach robust conclusions regarding evolution. We request 20.6 hours to complete MIPS and IRAC imaging of the 9 clusters. We will measure star-formation rates of one solar mass per year from MIPS 24 and 70 um photometry. We will measure stellar mass and identify AGN using the IRAC data. All 9 clusters have extensive ground-based imaging and spectroscopy, and these additional data will maximize the scientific return of the Spitzer observations.
Finn Rose
Milvang-Jensen B.
Poggianti Bianca
Rines Kenneth
Rudnick Gregory
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