Astrophys. J., 698, 1943-1950 (2009/June-3)
Spectroscopic confirmation of a massive red-sequence-selected galaxy cluster at z = 1.34 in the SpARCS-south Cluster Survey.
WILSON G., MUZZIN A., YEE H.K.C., LACY M., SURACE J., GILBANK D., BLINDERT K., HOEKSTRA H., MAJUMDAR S., DEMARCO R., GARDNER J.P., GLADDERS M.D. and LONSDALE C.
Abstract (from CDS):
The Spitzer Adaptation of the Red-sequence Cluster Survey (SpARCS) is a z'-passband imaging survey, consisting of deep (z' ≃ 24 AB) observations made from both hemispheres using the CFHT 3.6 m and CTIO 4 m telescopes. The survey was designed with the primary aim of detecting galaxy clusters at z > 1. In tandem with pre-existing 3.6 µm observations from the Spitzer Space Telescope SWIRE Legacy Survey, SpARCS detects clusters using an infrared adaptation of the two-filter red-sequence cluster technique. The total effective area of the SpARCS cluster survey is 41.9 deg2. In this paper, we provide an overview of the 13.6 deg2 Southern CTIO/MOSAIC II observations. The 28.3 deg2 Northern CFHT/MegaCam observations are summarized in a companion paper by Muzzin et al. In this paper, we also report spectroscopic confirmation of SpARCS J003550-431224, a very rich galaxy cluster at z = 1.335, discovered in the ELAIS-S1 field. To date, this is the highest spectroscopically confirmed redshift for a galaxy cluster discovered using the red-sequence technique. Based on nine confirmed members, SpARCS J003550-431224 has a preliminary velocity dispersion of 1050±230 km/s. With its proven capability for efficient cluster detection, SpARCS is a demonstration that we have entered an era of large, homogeneously selected z > 1 cluster surveys.
cosmology: observations - galaxies: clusters: general - galaxies: high-redshift - infrared: galaxies - surveys
Text: SpARCS JHHMMSS+DDMMSS (No. J003550-431224) added. Table 2: SpARCS JHHMM.m+DDMM NNNN N=15 among (Nos 1-4001) added.
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