Galaxy Clusters Selected via the Sunyaev–Zel’dovich Effect in the SPTpol 100-square-degree Survey
Galaxy Clusters Selected via the Sunyaev–Zel’dovich Effect in the SPTpol 100-square-degree Survey
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DOI：
10.3847/1538-3881/ab6a96
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发表时间：
2019-07
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影响因子：
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通讯作者：
Norden E. Huang;L. Bleem;B. Stalder;P. Ade;S. Allen;A. Anderson;J. Austermann;J. Avva;J. Beall
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作者：
Norden E. Huang;L. Bleem;B. Stalder;P. Ade;S. Allen;A. Anderson;J. Austermann;J. Avva;J. Beall
我们给出了一个用南极望远镜上的SPTpol接收器探测到的100平方度的候选星系团的目录。该目录包含信噪比大于4.6时检测到的候选对象。候选者是利用95 GHz和150 GHz的Sunyaev-Zel‘dovich效应来选择的。使用空间和地面的光学和红外望远镜，我们已经确认了81个候选星系团。我们使用这些后续图像和档案图像来估计66个星系团的光度红移和光谱观测，以获得13个系统的红移。另外两个星系团仅使用近红外星系的过密度进行了确认，并且没有红移。我们发现15个候选者(占总样本的18%)处于红移z≥1.0，最大确认红移为。我们预计这个星表将包含调查区域内每一个星系团的星系团和z>；0.25。质量阈值在z=0.25以上大致恒定，完整星表的中位数质量约为。与前人的工作相比，增加了毫米波数据的深度(分别为11.2GHz和6.5GHzK-arcmin)，使得有可能发现更多高红移和低质量的星系团。
We present a catalog of galaxy cluster candidates detected in 100 square degrees surveyed with the SPTpol receiver on the South Pole Telescope. The catalog contains 89 candidates detected with a signal-to-noise ratio greater than 4.6. The candidates are selected using the Sunyaev–Zel’dovich effect at 95 and 150 GHz. Using both space- and ground-based optical and infrared telescopes, we have confirmed 81 candidates as galaxy clusters. We use these follow-up images and archival images to estimate photometric redshifts for 66 galaxy clusters and spectroscopic observations to obtain redshifts for 13 systems. An additional two galaxy clusters are confirmed using the overdensity of near-infrared galaxies only and are presented without redshifts. We find that 15 candidates (18% of the total sample) are at redshift z ≥ 1.0, with a maximum confirmed redshift of . We expect this catalog to contain every galaxy cluster with and z > 0.25 in the survey area. The mass threshold is approximately constant above z = 0.25, and the complete catalog has a median mass of approximately . Compared to previous SPT works, the increased depth of the millimeter-wave data (11.2 and 6.5 μK-arcmin at 95 and 150 GHz, respectively) makes it possible to find more galaxy clusters at high redshift and lower mass.