NOAO >   Observing Info >   Approved Programs >   2011A-0034

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Proposal Information for 2011A-0034


PI: Christopher W. Stubbs, Harvard University, stubbs@physics.harvard.edu
Address: Department of Physics, 17 Oxford St., Cambridge, MA 02138, USA

CoI: M. L. N. Ashby, Harvard-Smithsonian CfA
CoI: K. Anderson, MPE, Munich
CoI: G. Bazin, MPE, Munich
CoI: B. A. Benson, KICP, Univ of Chicago
CoI: L. E. Bleem, KICP, Univ of Chicago
CoI: M. Brodwin, Harvard-Smithsonian CfA
CoI: J. E. Carlstrom, KICP, Univ. of Chicago
CoI: A. Clocchiatti, U. Catholica, Chile
CoI: T. M. Crawford, KICP, Univ of Chicago
CoI: T. de Haan, Dept of Physics, McGill Univ Canada
CoI: M. A. Dobbs, Dept of Physics, McGill Univ Canada
CoI: J. P. Dudley, Dept of Physics, McGill Univ Canada
CoI: R. Foley, Harvard-Smithsonian CfA
CoI: M. D. Gladders, Univ of Chicago
CoI: F. W. High, KICP, Univ of Chicago
CoI: G. P. Holder, Dept of Physics, McGill Univ Canada
CoI: W. L. Holzapfel, Dept of Physics, UC Berkeley
CoI: R. Keisler, KICP, Univ of Chicago
CoI: D. P. Marrone, KICP, Univ of Chicago
CoI: J. J. Mohr, MPE, Munich Germany
CoI: T. Montroy, Case Western
CoI: C. L. Reichardt, UC Berkeley
CoI: A. Rest, STSCI
CoI: J. Ruel, Harvard University
CoI: J. E. Ruhl, Case Western Reserve Univ
CoI: B. Saliwanchik, blank
CoI: L. Shaw, Yale University
CoI: J. Song, Univ of Illinois
CoI: B. Stalder, Harvard-Smithsonian CfA
CoI: S. A. Stanford, UC Davis
CoI: A. A. Stark, Harvard-Smithsonian CfA
CoI: K. Story, blank
CoI: K. Vanderlinde, McGill Univ, Canada
CoI: R. Williamson, blank

Title: Spectroscopy of Galaxies in Massive Clusters: Galaxy Properties and Dynamical Cluster Mass Calibration

Abstract: We propose to acquire GMOS spectroscopy of 85 clusters of galaxies selected via the Sunyaev-Zel'dovich (SZ) effect from the South Pole Telescope (SPT) microwave background survey. This will bring our total to 100 SPT clusters with velocity dispersions. The SPT survey is delivering a uniformly-selected high-mass cluster sample that is essentially volume-complete beyond z>0.3. We will target a subset (0.3 < z < 0.8) of the SPT cluster catalog, extracted from 2500 \mathrmdeg^2. This data set will establish competitive, independent constraints on cosmological parameters, including the nature of the dark energy. Achieving this goal requires a precise understanding of the relationship between the cluster's SZ signature and the cluster mass, and this mass normalization is currently the largest systematic error in SPT's cosmological constraints. One promising method of determining galaxy cluster masses is to probe the dark matter potential with galaxy velocities. Using data from a large cluster sample will average over random projection effects, and will enable the calibration of the SZ-mass scaling relation, in conjunction with X-ray and lensing data on a smaller sample. The cluster galaxy spectroscopy we obtain will also equip the community to address a wide range of questions in galaxy evolution and cluster astrophysics.


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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