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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 559157.0, MPI für Astronomie / Publikationen_mpia
Spectroscopic confirmation of three red-sequence selected galaxy clusters at z = 0.87, 1.16, and 1.21 from the SpARCS Survey
Authors:Demarco, R.; Wilson, G.; Muzzin, A.; Lacy, M.; Surace, J.; Yee, H. K. C.; Hoekstra, H.; Blindert, K.; Gilbank, D.
Date of Publication (YYYY-MM-DD):2010
Journal Abbrev.:The Astrophysical Journal
Issue / Number:2
Start Page:1185
End Page:1197
Audience:Not Specified
Abstract / Description:The Spitzer Adaptation of the Red-sequence Cluster Survey (SpARCS) is a z'-passband imaging survey of the 50 deg2 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. Some of the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation.
Free Keywords:galaxies: clusters: general; galaxies: clusters: individual: SpARCS J161315+564930 SpARCS J161037+552417 SpARCS J161641+554513; galaxies: evolution; galaxies: formation
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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