Tracing Star Formation History in RCS Galaxy Clusters

Physics

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Scientific paper

We propose to obtain MIPS 24micron images for 48 clusters selected from the Red-Sequence Cluster Survey to study the evolution of star formation history and AGN fraction and their dependence on galaxy environment. The cluster sample contains relatively rich clusters (50% with estimated richness richer than mid-Abell class 1), and covers a large redshift range (0.3 to 1.1) uniformly. Current studies of star formation in mid-redshift suggest that a significant fraction of star formation in clusters may be hidden by dust. A statistically robust census using a well-defined cluster sample will greatly improve our understanding of galaxy evolution clusters and the role the environment plays. We will be able to measure star formation rate to 30 Msun/yr, for the overall sample, and to ~10-15Msun/yr for a subsample of z~1 clusters. The combination of the MIPS data and allocated IRAC imaging of the same sample will allow us to disentangle starburst/AGN sources. We will derive the excess 24micron sources in clusters as a function of redshift, study the spatial distribution of dusty starbursts and AGN in clusters, and the dependence of these activities on the properties of the clusters. Furthermore, these clusters have extensive ancillary follow-up data, including deep 4-color optical photometry, H or K band NIR imaging, multi-object spectroscopy, HST-ACS images, and SCUBA and deep radio imaging, allowing us to carry out detailed studies of the properties of 24micron luminous galaxies in clusters.

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