NOAO >   Observing Info >   Approved Programs >   2009B-0415

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Proposal Information for 2009B-0415


PI: Joseph Mohr, University of Illinois, jmohr@illinois.edu
Address: Department of Astronomy, 103 Astronomy Building, 1002 West Green Street, Urbana, IL, 61801, USA

CoI: Adam Stanford, UC Davis
CoI: Anthony Gonzalez, University of Florida
CoI: Ryan Foley, SAO
CoI: Alfredo Zenteno, University of Illinois
CoI: Jeeseon Song, University of Illinois
CoI: Christopher Stubbs, Harvard University
CoI: Armin Rest, Harvard University
CoI: Will High, Harvard University
CoI: John Carlstrom, University of Chicago
CoI: Tom Crawford, University of Chicago

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

Abstract: We propose to carry out GMOS spectroscopy in eleven Sunyaev-Zel'dovich Effect (SZE) selected clusters from the South Pole Telescope (SPT) survey. These systems are the high z part (0.5<z<1) of a complete sample of 16 clusters extracted from 200 deg^2 of sky with masses above M 5x10^14Mo. 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 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. With the proposed spectroscopy we will confirm the existence of dynamically bound collections of galaxies, providing a crucial test of the SPT cluster selection. We will observe two masks in each system, providing enough member redshifts to measure the cluster velocity dispersion and to measure the redshifts of giant arcs where they are present. This information, together with X-ray data from scheduled Chandra and XMM observations of these clusters and a proposed deep lensing study will provide crucial constraints on the masses of these SZE selected systems.


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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