NOAO >   Observing Info >   Approved Programs >   2010B-0598

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Proposal Information for 2010B-0598


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

CoI: Robert Armstrong, University of Illinois & NCSA
CoI: Shantanu Desai, University of Illinois & NCSA
CoI: Joseph Mohr, University of Illinois & LMU & MPE
CoI: John Carlstrom, University of Chicago
CoI: Alfredo Zenteno, LMU
CoI: Christopher Stubbs, Harvard University
CoI: Mark Brodwin, Harvard-Smithsonian Center for Astrophysics
CoI: William Holzapfel, University of California at Berkeley

Title: Optical/NIR Confirmation and Redshift Measurements for South Pole Telescope Selected Galaxy Clusters

Abstract: We request Blanco Mosaic2 to acquire deep multiband imaging of 125 newly discovered South Pole Telescope SZE selected galaxy clusters. We further request Blanco NEWFIRM Near-IR imaging for those candidates that do not show up in the deep multiband optical images. With these observations, we can (1) confirm the candidates as galaxy clusters, (2) measure cluster redshifts, (3) image potential z>0.9 systems that are not readily apparent in multiband optical follow-up. These follow-up observations also can aid in selecting systems for more detailed optical spectroscopic, weak lensing and X-ray studies. This sample will come from an analysis of the multifrequency SPT maps in the first 500 deg^2 centered on (alpha)=02^h30^m, (delta)=-50^\circ surveyed in 2010. We focus on a subsample of clusters with S/N >4.5. X-ray observations indicate that this signal- to-noise value corresponds to a mass threshold of M~eq5\times10^14M_\odot. Simulations and initial optical follow-up indicate that this sample has a low (<~25%) contamination level. Optical/NIR confirmation and redshift estimation are required for us to use the uniform and approximately mass selected SPT cluster sample to study cosmology.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



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