Galaxy Evolution in Rich Clusters at z>1

Details Galaxy Evolution in Rich Clusters at z>1 Galaxy Evolution in Rich Clusters at z>1

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009noao.prop..486w&link_type=abstract

NOAO Proposal ID #2009B-0486

Computer Science

Scientific paper

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 × 10 arcmin (5 × 5 Mpc) FOV. We propose u'g'r'i'JK_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 stellar 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' 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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