NOAO >   Observing Info >   Approved Programs >   2011B-0413

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Proposal Information for 2011B-0413


PI: Gillian Wilson, UC Riverside, gillianw@ucr.edu
Address: Department of Physics and Astronomy, University of California Riverside, 900 University Ave, Riverside, CA, 92521, USA

CoI: Howard Yee, University of Toronto
CoI: Adam Muzzin, Yale University
CoI: Alessandro Rettura, UC Riverside
CoI: Lei Bai, University of Toronto
CoI: Michael Balogh, University of Waterloo
CoI: Douglas Burke, Chandra Science Center, Harvard-Smithsonian Center for Astrophyics
CoI: Ricardo Demarco, University of Concepcion
CoI: Erica Ellingson, University of Colorado at Boulder (CASA)
CoI: Jonathan Gardner, NASA/Goddard Flight Center
CoI: David Gilbank, University of Waterloo
CoI: Mike Gladders, University of Chicago
CoI: Amalia Hicks, Michigan State University
CoI: Henk Hoekstra, Leiden Observatory
CoI: Mark Lacy, NRAO
CoI: Chris Lidman, Anglo-Australian Observatory
CoI: Subhabrata Majumdar, Tata Institute for Fundamental Research
CoI: Jason Surace, Spitzer Science Center
CoI: Tracy Webb, McGill University

Title: The Gemini Cluster Astrophysics Spectroscopic Survey (GCLASS)

Abstract: We re-propose for the final two masks required to complete our GMOS spectroscopic survey of 10 rich clusters at z 1.1 drawn from the SpARCS IR cluster survey. Although band-1 time for three GMOS-S masks was awarded in 2010B, because of the engineering shutdown/mirror re-coating in October 2010, only one mask was acquired. These data will be used in conjunction with multiwavelength optical/NIR/MIR photometry to measure the SFRs, stellar masses, ages, and merger rates of galaxies in high-redshift, high-density environments. We will also study the kinematics of clusters during their most active accretion phase and determine velocity dispersions, which will allow the first calibration of mass-richness scaling relations for clusters at z > 1, a key component for cluster cosmology projects. Because they are selected from a deep, wide-field IR-survey, GCLASS clusters are massive, yet unbiased with respect to their X-ray luminosity. This unique selection criterion makes GCLASS complementary to previous studies of z > 1 X-ray selected clusters, and the low-mass z > 1 clusters selected from smaller-volume IR surveys. This project employs the unique microslit capability of GMOS in band-shuffle mode which permits the placement of up to 55 slits in a 3.0' x 1.7' area.


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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