Cluster Environmental Effects on Galaxy Evolution at z=0.2 (Abell 963 vs. Abell 2192)

Details Cluster Environmental Effects on Galaxy Evolution at z=0.2 (Abell 963 vs. Abell 2192) Cluster Environmental Effects on Galaxy Evolution at z=0.2 (Abell 963 vs. Abell 2192)

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40784c&link_type=abstract

Spitzer Proposal ID #40784

Physics

Scientific paper

We propose Spitzer IRAC and MIPS observations for two carefully selected clusters at z=0.2. This is the lowest redshift where the Butcher Oemler effect has been seen and the highest redshift where HI imaging is feasible with current instrumentation. Abell 963 is a rich and X-ray luminous cluster with an unusually high fraction of blue galaxies while Abell 2192 is less massive and has more substructure. To address the question of how galaxies get affected by the surroundings, we will investigate star formation and gas properties of galaxies in those two clusters as a function of environment. Using the Spitzer data, we will study star-forming or AGN activities, star formation histories, and dust contents. We are building up a multiwavelength database on the two clusters. Specifically, we have been allocated 2000 hrs of WSRT time to image the clusters in HI and 250 hrs of FCRAO time to determine the CO content of the cluster galaxies. We are also obtaining optical imaging and spectroscopy data. This unique dataset will allow us to relate star formation rates and histories directly to the gas content and stellar populations for the first time at this redshift. In addition, we will probe not only galaxies in the two clusters but also fore/background systems, using the huge velocity coverages of the HI and CO observations. In order to trace galaxies with normal star formation rates (1-2 Msun/yr) with S/N>5 in all four IRAC bands and 24/70 microns, we request 3.4 hours of IRAC and 11.8 hours of MIPS observation time on each cluster, yielding 30.4 hours of the integration time in total.

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