Obscured starbursts in galaxy clusters: a MIPS survey of z=0.5 clusters

Details Obscured starbursts in galaxy clusters: a MIPS survey of z=0.5 clusters Obscured starbursts in galaxy clusters: a MIPS survey of z=0.5 clusters

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50210s&link_type=abstract

Spitzer Proposal ID #50210

Physics

Scientific paper

We propose panoramic MIPS 24um imaging of four intermediate redshift (z~0.5) clusters selected from the MACS X-ray Survey. We will combine these with observations of four clusters at the same epoch from our pilot study (which span a broader range in mass) to parameterize the evolutionary sequence of infalling field galaxies in terms of the cluster global structure. This analysis will distinguish between the role of global and local environment in determining the star formation histories of starburst galaxies entering the cluster potential from the low-density field. Our previous successful MIPS project has yielded some exciting results - in particular the existence of large populations of starburst galaxies in z~0.5 clusters with strong PAH emission - which have been completely overlooked by previous optical/near-IR surveys of these well-studied systems. These are potentially the missing link between distant spirals and the local passive S0 galaxies which are the dominant population in local clusters. Our initial results point to a strong dependence of star formation on specific cluster properties - either the dynamical state or the cluster mass (or equivalently temperature of the ICM). By specifically targeting four clusters with a narrow range in mass, but a wide range of structures, we aim to determine the key drivers of the variation in the starburst population within clusters. This will provide vital clues as to the physics of environmental transformations of galaxies: an important ingredient of current galaxy evolution models.

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