NOAO >   Observing Info >   Approved Programs >   2010B-0582

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Proposal Information for 2010B-0582


PI: Adam Stanford, University of California, Davis, stanford@physics.ucdavis.edu
Address: Physics Department, One Shields Avenue, UC-Davis, Davis, CA 95616, USA

CoI: Joseph Mohr, Universitats-Sternwarte Munchen
CoI: Mark Brodwin, Center for Astrophysics
CoI: Gurvan Bazin, Universitats-Sternwarte Munchen
CoI: Jonathan Ruel, Harvard University
CoI: John Carlstrom, University of Chicago
CoI: Will High, Harvard University
CoI: Chris Stubbs, Harvard University
CoI: Bill Holzapfel, University of California, Berkeley
CoI: Gil Holder, McGill University

Title: Dynamical Mass Estimates of South Pole Telescope SZE Selected Galaxy Clusters

Abstract: We propose to carry out GMOS spectroscopy in 13 Sunyaev-Zel'dovich Effect (SZE) selected clusters from the South Pole Telescope (SPT) survey. These systems are the moderate-z (0.5 < z < 0.75) subset of a complete sample of 66 SZE-selected clusters extracted from 600 deg^2 of the surveyed area with masses above M 4 x 10^14 M(sun). The SPT cluster survey is designed to deliver large and uniformly selected cluster samples to enable a study of the cosmic acceleration. Achieving this scientific goal requires understanding the SPT cluster selection and developing a precise understanding of the relationship between the amplitude of the cluster SZE signature and the cluster mass. Our Gemini program is designed to address both these needs. We will observe two masks in each cluster, providing enough member redshifts to measure the cluster velocity dispersion. The dispersions will provide an important, independent check on the gas-phase cluster mass measures provided by the SZE and X-ray data, and will help to characterize the SPT selection function.


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