NOAO >   Observing Info >   Approved Programs >   2011B-0389

Small NOAO Logo

Proposal Information for 2011B-0389


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: 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 Confirmation and Redshift Measurements for South Pole Telescope Selected Galaxy Clusters

Abstract: We request time on the SOAR SOI imager and Blanco Mosaic2 imager to acquire deep multiband imaging of a mass-limited sample of ~eq 130 high-redshift (z>0.5) galaxy clusters. The clusters are uniformly selected by their Sunyaev-Zel'dovich effect signature from the South Pole Telescope (SPT) 2500 deg^2 survey. With these observations, we can (1) confirm the candidates as galaxy clusters, (2) measure cluster redshifts, and (3) study evolution of the cluster galaxy populations. The redshift measurements are critical to the cosmological constraints of the SPT survey, which will constrain cosmological parameters through a measurement of the redshift evolution of the galaxy cluster abundance. In addition, these observations are the required first step towards more detailed optical, spectroscopic, weak lensing and X-ray studies of this unique massive high-redshift cluster sample. The positions of these candidate clusters will be between declinations of -65^\circ and - 40^\circ and right ascensions between 20 hr and 7 hr. We will 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 threshold corresponds to a mass limit of M_200 ~ 3\times10^14M_\odot h^-1.


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



NOAO >   Observing Info >   Approved Programs >   2011B-0389

noaoprop-help@noao.edu

Small NOAO Logo