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Spectroscopic Confirmation of Three Red-sequence Selected Galaxy Clusters at z = 0.87, 1.16, and 1.21 from the SpARCS Survey

Demarco, Ricardo and Wilson, Gillian and Muzzin, Adam and Lacy, Mark and Surace, Jason and Yee, H. K. C. and Hoekstra, Henk and Blindert, Kris and Gilbank, David (2010) Spectroscopic Confirmation of Three Red-sequence Selected Galaxy Clusters at z = 0.87, 1.16, and 1.21 from the SpARCS Survey. Astrophysical Journal, 711 (2). pp. 1185-1197. ISSN 0004-637X.

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The Spitzer Adaptation of the Red-sequence Cluster Survey (SpARCS) is a z'-passband imaging survey of the 50 deg^2 Spitzer SWIRE Legacy fields, designed with the primary aim of creating the first large, homogeneously selected sample of massive clusters at z > 1. SpARCS uses an infrared adaptation of the two-filter cluster red-sequence technique. In this paper, we report Keck/LRIS spectroscopic confirmation of two new exceptionally rich galaxy clusters, SpARCS J161315+564930 at z = 0.871 ± 0.002, with 14 high-confidence members and a rest-frame velocity dispersion of σ_v = 1230 ± 320 km s^(–1), and SpARCS J161641+554513 at z = 1.161 ± 0.003, with seven high-confidence members (including one active galactic nucleus) and a rest-frame velocity dispersion of σ_v = 950 ± 330 km s^(–1). We also report confirmation of a third new system, SpARCS J161037+552417 at z = 1.210 ± 0.002, with seven high-confidence members and a rest-frame velocity dispersion of σ v = 410 ± 300 km s^(–1). These three new spectroscopically confirmed clusters further demonstrate the efficiency and effectiveness of two-filter imaging for detecting bona fide galaxy clusters at high redshift. We conclude by demonstrating that prospects are good for the current generation of surveys aiming to estimate cluster redshifts and masses at z ≳ 1 directly from optical-infrared imaging.

Item Type:Article
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URLURL TypeDescription
Demarco, Ricardo0000-0003-3921-2177
Wilson, Gillian0000-0002-6572-7089
Muzzin, Adam0000-0002-9330-9108
Lacy, Mark0000-0002-3032-1783
Surace, Jason0000-0001-7291-0087
Additional Information:© 2010 American Astronomical Society. Issue 2 (2010 March 10); received 2009 August 17; accepted for publication 2010 February 1; published 2010 February 22. We thank the referee for useful comments. The authors recognize and acknowledge the very significant cultural role and reverence that the summit of Mauna Kea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain. This work is based in part on archival data obtained with the Spitzer, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. Support for this work was provided by an award issued by JPL/Caltech. G.W. also gratefully acknowledges support from NSF grant AST-0909198, and from the College of Natural and Agricultural Sciences at UCR. Facilities: Keck: I, Spitzer (IRAC), CFHT (MegaCam)
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
University of California, RiversideUNSPECIFIED
Subject Keywords:galaxies: clusters: general – galaxies: clusters: individual (SpARCS J161315+564930, SpARCS J161037+552417, SpARCS J161641+554513) – galaxies: evolution – galaxies: formation
Issue or Number:2
Record Number:CaltechAUTHORS:20100317-113602948
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Official Citation:Spectroscopic Confirmation of Three Red-sequence Selected Galaxy Clusters at z = 0.87, 1.16, and 1.21 from the SpARCS Survey Ricardo Demarco, Gillian Wilson, Adam Muzzin, Mark Lacy, Jason Surace, H. K. C. Yee, Henk Hoekstra, Kris Blindert, and David Gilbank doi: 10.1088/0004-637X/711/2/1185
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:17764
Deposited By: Jason Perez
Deposited On:18 Mar 2010 18:40
Last Modified:07 Nov 2019 23:35

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