Computer Science
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010noao.prop..343w&link_type=abstract
NOAO Proposal ID #2010A-0343
Computer Science
Scientific paper
We propose for the penultimate 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 criteria makes GCLASS complementary to previous studies of z > 1 X-ray selected clusters, as well as the low-mass z > 1 clusters selected from IR surveys that probe smaller volumes. This project takes advantage of the unique microslit capability of GMOS in band-shuffle mode which allows the compact placement of up to 55 slits in only a 3.0' x 1.7' area. Our previous allocations show that this capability makes GMOS 4 times more efficient than Keck/DEIMOS or VLT/FORS2 at obtaining redshifts within the cluster virial radius at z > 1.
Balogh Michael
Blindert Kris
Burke Douglas
Bursick Shelly
Demarco Ricardo
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