NOAO >   Observing Info >   Approved Programs >   2009B-0376

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Proposal Information for 2009B-0376


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: Micheal Balogh, University of Waterloo
CoI: Kris Blindert, Max Plank Institute for Astrophysics
CoI: Douglas Burke, Chandra Science Center, Harvard-Smithsonian Center for Astrophysics
CoI: Shelly Bursick, University of Arkansas
CoI: Ricardo Demarco, UC Riverside
CoI: Erica Ellingson, University of Colorado at Boulder (CASA)
CoI: Jonathan Gardner, NASA/Goddard Space 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, Spitzer Science Center
CoI: Subhabrata Majumdar, Tata Institute for Fundamental Research
CoI: Alessandro Rettura, Johns Hopkins University
CoI: Jason Surace, Spitzer Science Center
CoI: Tracy Webb, McGill University
CoI: Renbin Yan, University of Toronto

Title: The Gemini Cluster Astrophysics Spectroscopic Survey (GCLASS)

Abstract: We propose to continue our extensive spectroscopic survey of 10 rich clusters at z 1.1 drawn from the SpARCS IR cluster survey. These data will be used in conjunction with multiwavelength optical/NIR/MIR photometry to study the SFRs, stellar masses, merger rates, and dynamics of galaxies in high-redshift, high-density environments. This project will be the first to use a homogeneously-selected sample of rich clusters at z > 1, and will build upon the extensive spectroscopic datasets collected by the CNOC1/MORPHS and RCS/EDiSCS surveys at z=0.3 and z=0.7 respectively, providing complementary observations at the highest redshift still observable within the optical window. These data will also be used to study dynamics of clusters during their most active accretion phase, and to determine velocity dispersions, which will allow the first calibration of a mass-richness relation for clusters at z > 1. This project takes advantage of the unique microslit capability of GMOS in band-shuffle mode which allows the compact placement of up to 40 slits in only a 1.7' area. This capability makes GMOS 5 times more efficient than Keck/DEIMOS or VLT/FORS2 at obtaining redshifts within the cluster virial radius at z > 1.


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