The Gemini Cluster Astrophysics Spectroscopic Survey (GCLASS)

Details The Gemini Cluster Astrophysics Spectroscopic Survey (GCLASS) The Gemini Cluster Astrophysics Spectroscopic Survey (GCLASS)

Aug 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010noao.prop..232w&link_type=abstract

NOAO Proposal ID #2010B-0232

Computer Science

Scientific paper

We propose for the final semester of our GMOS 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 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, the 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. Our previous allocations show that this capability makes GMOS 4 times more efficient than DEIMOS/FORS2 at obtaining redshifts within the cluster virial radius at z > 1.

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