Astrophys. J., 711, 1185-1197 (2010/March-2)
Spectroscopic confirmation of three red-sequence selected galaxy clusters at z = 0.87, 1.16, and 1.21 from the SpARCS survey.
DEMARCO R., WILSON G., MUZZIN A., LACY M., SURACE J., YEE H.K.C., HOEKSTRA H., BLINDERT K. and GILBANK D.
Abstract (from CDS):
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 σv= 1230±320 km/s, 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 σv= 950±330 km/s. 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. 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.
galaxies: clusters: general - galaxies: clusters: individual (SpARCS J161315+564930, SpARCS J161037+552417, SpARCS J161641+554513) - galaxies: evolution - galaxies: formation
Table 1: SpARCS JHHMMSS+DDMMSS N=3. Tables 2-4: [DWM2010] NNNNNNN N=22+19+34 among (Nos 708779-4000032).
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