The swift x-ray telescope cluster survey. iii. cluster catalog from 2005-2012 archival data
The swift x-ray telescope cluster survey. iii. cluster catalog from 2005-2012 archival data
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快速X射线望远镜星团巡天。
DOI：
10.1088/0067-0049/216/2/28
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Giavalisco Mauro
中科院分区：
文献类型：
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作者：
Liu Teng;Tozzi Paolo;Tundo Elena;Moretti Alberto;Rosati Piero;Wang Jun-Xian;Tagliaferri Gianpiero;Campana Sergio;Giavalisco Mauro
我们提出的斯威夫特X射线星系团调查（SWXCS）目录获得的档案数据从X射线望远镜（XRT）上的斯威夫特卫星从2005年2月至2012年11月，延长了第一次发布的SWXCS。该目录提供了位置，软通量，并在可能的情况下，光学对应的X射线组和集群候选人的通量有限的样本。我们考虑具有银河纬度的场|B|> 20以避免高的H1柱密度。我们放弃了所有针对星系群或星系团的观测，以及不适合寻找微弱扩展源的特定河外场。我们最终选择了3000个有用的领域，覆盖总立体角为400度2。我们确定扩展源候选人在软带（0.5-2千电子伏）的图像，这些领域使用的软件EXSdetect，这是专门校准的XRT数据。广泛的模拟用于评估污染和完整性作为源信号的函数，使我们能够尽量减少虚假检测的数量，并鲁棒地评估选择函数。我们的星表包括263个候选星系团和星系群，在软波段的通量极限为7× 10− 15 erg cm− 2 s− 1，logN-logS与以前的深X射线测量非常一致。最终的来源列表与已发表的光学，X射线和Sunyaev-Zeldovich星团目录相互关联。我们发现，137个来源已被确定为集群在独立的调查文献中，而126个是新的检测。目前，我们已经收集了158个源的红移信息（占整个样本的60%）。一旦光学跟踪和源的X射线光谱分析完成，SWXCS将提供一个大型的和定义明确的星系群和星系团目录，以进行星系团特性的统计研究和宇宙学模型的测试。
We present the Swift X-ray Cluster Survey (SWXCS) catalog obtained using archival data from the X-ray telescope (XRT) on board the Swift satellite acquired from 2005 February to 2012 November, extending the first release of the SWXCS. The catalog provides positions, soft fluxes, and, when possible, optical counterparts for a flux-limited sample of X-ray group and cluster candidates. We consider the fields with Galactic latitude| b|> 20 to avoid high H i column densities. We discard all of the observations targeted at groups or clusters of galaxies, as well as particular extragalactic fields not suitable to search for faint extended sources. We finally select∼ 3000 useful fields covering a total solid angle of∼ 400 deg 2. We identify extended source candidates in the soft-band (0.5–2 keV) images of these fields using the software EXSdetect, which is specifically calibrated for the XRT data. Extensive simulations are used to evaluate contamination and completeness as a function of the source signal, allowing us to minimize the number of spurious detections and to robustly assess the selection function. Our catalog includes 263 candidate galaxy clusters and groups down to a flux limit of 7× 10− 15 erg cm− 2 s− 1 in the soft band, and the logN-logS is in very good agreement with previous deep X-ray surveys. The final list of sources is cross-correlated with published optical, X-ray, and Sunyaev–Zeldovich catalogs of clusters. We find that 137 sources have been previously identified as clusters in the literature in independent surveys, while 126 are new detections. Currently, we have collected redshift information for 158 sources (60% of the entire sample). Once the optical follow-up and the X-ray spectral analysis of the sources are complete, the SWXCS will provide a large and well-defined catalog of groups and clusters of galaxies to perform statistical studies of cluster properties and tests of cosmological models.