A Joint Spitzer/Lensing Survey - Exploring the Connection Between Hierarchical Assembly and Starburst Activity in Galaxy Clusters at z=0.2

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Scientific paper

We propose to conduct a wide-field Spitzer/MIPS 24um survey of 32 X-ray luminous galaxy clusters at z~0.2. These 32 are drawn from the 100 clusters under intense multi-wavelength study as part of the Local Cluster Substructure Survey (LoCuSS). All 32 have high quality wide-field weak lensing data from Subaru, supplemented by HST imaging of the cluster cores. Our primary science goal is to achieve a definitive survey of starburst activity in local clusters and to correlate the amount of obscured activity with dynamical state of the clusters. The combination of the proposed 25'x25' MIPS 24um maps and our detailed lensing-based mass maps will be uniquely powerful for that purpose. The superb sensitivity of MIPS will allow us to detect LIRGs in the virialised region of each cluster in just ~1.2 hours per cluster; the structural analysis of the lensing mass maps will diagnose the amount and location of recent hierarchical infall into the clusters. We will therefore be able to quantify precisely the amount of obscured star formation in local clusters and to delineate how that activity relates to hierarchical assembly. Our results will therefore have a major impact on efforts to understand whether infalling spiral galaxies transform into S0 galaxies by gradual fading or via an intense starburst phase. For this huge statistical survey (several orders of magnitude larger than the state of the art), we request a modest 36 hours of observing time.

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