NOAO >   Observing Info >   Approved Programs >   2011A-0545

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Proposal Information for 2011A-0545


PI: Shantanu Desai, University of Illinois, shantanu@illinois.edu
Address: Dept. of Astronomy, 1002 West Green Street, Urbana, Il 61801, USA

CoI: Robert Armstrong, University of Illinois & NCSA
CoI: Jeeseon Song, Department of Physics, University of Michigan
CoI: Joseph Mohr, University of Illinois & LMU & MPE
CoI: Anthony Gonzalez, University of Florida
CoI: John Carlstrom, University of Chicago
CoI: Alfredo Zenteno, LMU
CoI: Gurvan Bazin, LMU
CoI: Lindsey Bleem, U Chicago
CoI: Will High, U Chicago
CoI: Tom Crawford, U Chicago
CoI: Christopher Stubbs, Harvard University
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 time on Blanco Mosaic2 to acquire deep multiband imaging of a high-redshift subset (with z > 0.5) of approximately 100 South Pole Telescope SZE selected galaxy clusters. Among these, approximately 40 will be new clusters from the 2011 season, 34 will be new candidates from the 2010 season, and the rest will be candidates requiring further observations. We further request Blanco NEWFIRM Near-IR imaging for optically confirmed clusters with z > 1 as well as for imaging high significance SPT candidates that have not been optically confirmed. With these observations, we can (1) confirm the candidates as galaxy clusters, (2) measure cluster redshifts, (3) image potential z > 1 systems that are not readily apparent in multiband optical followup in NIR, and (4) measure properties and evolution of the galaxy cluster populations. These follow-up observations are central to more detailed optical spectroscopic, weak lensing and X-ray studies. The sample targets will come from an analysis of the multifrequency SPT maps in the first 1800 deg^2 centered on (alpha)=02^h30^m, (delta)=- 50^\circ. We focus on a subsample of candidates with S/N >4.5 and use the Digitized Sky Survey (DSS) to prescreen candidates to remove those at z \le 0.5. X-ray observations indicate that this signal-to- noise value corresponds to a mass threshold of M~eq4\times10^14M_\odot h^-1.


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