NOAO >   Observing Info >   Approved Programs >   2009B-0486

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Proposal Information for 2009B-0486


PI: Gillian Wilson, University of California Riverside, gillianw@ucr.edu
Address: Physics Department, 900 University Avenue, Riverside, CA 92521, US

CoI: Ricardo Demarco, University of California Riverside
CoI: Alessandro Rettura, Johns Hopkins University
CoI: Adam Muzzin, Yale University
CoI: Howard Yee, University of Toronto
CoI: Jason Surace, Spitzer Science Center / Caltech
CoI: Mark Lacy, Spitzer Science Center / Caltech
CoI: Erica Ellingson, University of Colorado
CoI: Amalia Hicks, Michigan State University
CoI: Henk Hoekstra, Leiden University
CoI: Michael Balogh, University of Waterloo
CoI: David Gilbank, University of Waterloo
CoI: Tracy Webb, McGill University
CoI: Kris Blindert, MPIA
CoI: Renbin Yan, University of Toronto
CoI: Subhabrata Majumdar, TIFR
CoI: Shelly Bursick, University of Arkansas
CoI: Jonathan P. Gardner, NASA Goddard Space Flight Center
CoI: Mike Gladders, University of Chicago

Title: Galaxy Evolution in Rich Clusters at z>1

Abstract: We are carrying out a large ~200 hour multi-semester spectroscopic campaign with Gemini/GMOS, ``GCLASS'', to measure redshifts for fifty members in a sample of ten extremely rich homogeneously-selected clusters with median redshift z=1.1 from the 42 deg^2 SpARCS IR cluster survey. These clusters also have very deep, widefield follow-up Spitzer imaging over a 10 \times 10 \arcmin (5 \times 5 Mpc) FOV. We propose u^\primeg^\primer^\primei^\primeJK_s imaging of the four Southern clusters from our GCLASS sample. This multipassband photometric dataset will allow us to determine photometric redshifts, complementing the GCLASS spectroscopic redshifts. The SpARCS/GCLASS sample will allow us to quantify cluster-to-cluster variations in galaxy evolution, and also to compare to the RCS core sample at z<1, to field galaxies at z>1, and to semi-analytic models (SAMs). We will construct, for the first time, a \emphstellar mass-selected sample of cluster galaxies at z~1. The wide FOV of IMACS/ISPI will match the existing deep, widefield Spitzer and CTIO z^\prime observations, and allow us to study changes in galaxy properties (stellar masses, star formation rates, specific star formation rates, galaxy colors, ages, extinctions, red sequence assembly) over several decades in density, all the way out to the infall regions of the clusters.


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