SpARCS-North星系团巡天中两个z ~ 1.2大质量红序星系团的光谱确认
Spectroscopic Confirmation of Two Massive Red-Sequence-Selected Galaxy Clusters at z ~ 1.2 in the SpARCS-North Cluster Survey
摘要：
Spitzer Adaptation of the Red Sequence Cluster Survey（SpARCS）是一项深度z波段成像调查，覆盖了Spitzer SWIRE Legacy领域，旨在使用红外适应性的星团红色序列方法创建第一个z > 1的大质量星团的大型精选样本。我们现在概述的是CFHT/MegaCam观测到的、覆盖28.3度^[2]的北半球部分。这次巡天的南部分量是由CTIO/MOSAICII观测到的，覆盖13.6 deg^2，威尔逊等人（2008）的一篇配套论文对此进行了总结。我们还提出了两个丰富的集群候选人在z ~ 1.2的光谱确认。基于Gemini上GMOS-N的Nod-and-Shuffle光谱，在SpARCS J163435+402151和SpARCS J163852+403843中确认了17和28个簇成员，它们的光谱红移分别为1.1798和1.1963。这两个星团的速度色散分别为490 +/- 140 km/s和650 +/- 160 km/s，这意味着质量（M200）分别为（1.0 +/- 0.9）x 10^{14} M_{solar}和（2.4 +/- 1.8）x 10^{14} M_{solar}。确认这些候选者是真正的大质量星系团表明，双滤波器成像是一种有效的，但观测效率高，选择z > 1的星系团的方法。
英文摘要：
The Spitzer Adaptation of the Red-sequence Cluster Survey (SpARCS) is a deep z'-band imaging survey covering the Spitzer SWIRE Legacy fields designed to create the first large homogeneously-selected sample of massive clusters at z > 1 using an infrared adaptation of the cluster red-sequence method. We present an overview of the northern component of the survey which has been observed with CFHT/MegaCam and covers 28.3 deg^2. The southern component of the survey was observed with CTIO/MOSAICII, covers 13.6 deg^2, and is summarized in a companion paper by Wilson et al. (2008). We also present spectroscopic confirmation of two rich cluster candidates at z ~ 1.2. Based on Nod-and-Shuffle spectroscopy from GMOS-N on Gemini there are 17 and 28 confirmed cluster members in SpARCS J163435+402151 and SpARCS J163852+403843 which have spectroscopic redshifts of 1.1798 and 1.1963, respectively. The clusters have velocity dispersions of 490 +/- 140 km/s and 650 +/- 160 km/s, respectively which imply masses (M200) of (1.0 +/- 0.9) x 10^{14} M_{solar} and (2.4 +/- 1.8) x 10^{14} M_{solar}. Confirmation of these candidates as bona fide massive clusters demonstrates that two-filter imaging is an effective, yet observationally efficient, method for selecting clusters at z > 1.
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