Mathematics – Logic
Scientific paper
Feb 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007noao.prop..156m&link_type=abstract
NOAO Proposal ID #2007A-0156
Mathematics
Logic
Scientific paper
We propose GMOS spectroscopy of two extremely rich clusters which are candidates for the most distant galaxy clusters yet detected. The clusters have photometric redshifts of 1.42 and 1.50 and the near-IR richness-mass correlation indicates that their masses are comparable to the Coma cluster (7 and 5 x 10^14 solar masses respectively). The clusters were discovered in the first 14 deg^2 of the Spitzer Adaptation of the Red-Sequence Cluster Survey (SpARCS) based on their [0.91] - [3.6] micron color-magnitude relation. The GMOS spectroscopy will be used to A) spectroscopically confirm the clusters and their redshift B) measure a velocity dispersion and derive a dynamical estimate of the total mass and C) study the emission-line fraction of red-sequence galaxies at high-z. The confirmation of these clusters will double the number of known clusters at z > 1.4. In addition, the verification of two massive clusters at such high redshift in a relatively small survey area will test the bounds of current cosmological parameters.
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