NOAO >   Observing Info >   Approved Programs >   2009B-0400

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Proposal Information for 2009B-0400


PI: Jeeseon Song, University of Illinois, jsong4@illinois.edu
Address: Dept. of Astronomy, 1002 West Green Street, Urbana, IL 61801, USA

CoI: Alfredo Zenteno, University of Illinois
CoI: Shantanu Desai, University of Illinois
CoI: Joseph Mohr, University of Illinois
CoI: Christopher Stubbs, Harvard University
CoI: John Carlstrom, University of Chicago
CoI: Bill Holzapfel, University of California at Berkeley

Title: Optical/NIR Confirmation and Photo-z's for South Pole Telescope SZE Selected Galaxy Clusters

Abstract: We request Blanco ISPI and Mosaic2 time to acquire deep multiband imaging of 100 additional South Pole Telescope SZE selected galaxy clusters. These images will enable us to (1) confirm these SZE selected targets as galaxy clusters, (2) measure their redshifts photometrically, (3) select systems for more detailed optical spectroscopic, weak lensing and X-ray studies and (4) study the galaxy populations and their redshift evolution. Our cluster sample comes from an analysis of the multi-frequency SPT maps in a deep, 200 deg^2 survey region completed last season (2008) and from the first 300 deg^2 of the current season survey that began in late February 2009. We are focusing on a S/N>4.5 subsample of clusters, which our mock observations and initial optical followup indicate has low contamination. A crude mass calibration using completed Chandra observations of four of these systems indicates this S/N cut corresponds approximately to a mass limited sample with a threshold of M~4\times10^14M_\odot. Multiband optical/NIR followup of these systems is the crucial next step that will enable characterization of the SPT selected cluster sample and their use in studies of structure formation and cosmology.


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