Spectroscopic Confirmation of a Massive Red-Sequence-Selected Galaxy Cluster at z = 1.34 in the SpARCS-South Cluster Survey

Gillian Wilson; Adam Muzzin; H. K. C. Yee; Mark Lacy; Jason Surace; David Gilbank; Kris Blindert; Henk Hoekstra; Subhabrata Majumdar; Ricardo Demarco; Jonathan P. Gardner; Michael D. Gladders; Carol Lonsdale

doi:10.1088/0004-637x/698/2/1943

arXiv · 0810.0036

Spectroscopic Confirmation of a Massive Red-Sequence-Selected Galaxy Cluster at z = 1.34 in the SpARCS-South Cluster Survey

Gillian Wilson·Adam Muzzin·H. K. C. Yee·Mark Lacy·Jason Surace·David Gilbank·Kris Blindert·Henk Hoekstra·Subhabrata Majumdar·Ricardo Demarco·Jonathan P. Gardner·Michael D. Gladders·Carol Lonsdale

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Abstract

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 3.6m and CTIO 4m telescopes. The survey was designed with the primary aim of detecting galaxy clusters at z >~ 1. In tandem with pre-existing 3.6um 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 deg^2. In this paper, we provide an overview of the 13.6 deg^2 Southern CTIO/MOSAICII observations. The 28.3 deg^2 Northern CFHT/MegaCam observations are summarized in a companion paper by Muzzin et al. (2008). 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.

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Gillian Wilson, Adam Muzzin, H. K. C. Yee, Mark Lacy, Jason Surace, David Gilbank, Kris Blindert, Henk Hoekstra, Subhabrata Majumdar, Ricardo Demarco, Jonathan P. Gardner, Michael D. Gladders, Carol Lonsdale. 2008-10-01. Spectroscopic Confirmation of a Massive Red-Sequence-Selected Galaxy Cluster at z = 1.34 in the SpARCS-South Cluster Survey. https://doi.org/10.1088/0004-637x%2F698%2F2%2F1943

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