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arXiv 1503.04051astro-ph.CO
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斯威夫特X射线望远镜星团巡天III:2005-2012年档案数据的星团目录

The Swift X-ray Telescope Cluster Survey III: Cluster Catalog from 2005-2012 Archival Data

Teng Liu, Paolo Tozzi, Elena Tundo, Alberto Moretti, Piero Rosati, Jun-Xian Wang, Gianpiero Tagliaferri, Sergio Campana, Mauro Giavalisco

摘要:

我们提出的斯威夫特X射线集群调查(SWXCS)目录使用的存档数据从X射线望远镜(XRT)上的斯威夫特卫星从2005年到2012年获得,扩展了第一次发布的SWXCS。该目录提供了位置,软通量,并在可能的情况下,光学对应物的X射线组和集群候选人的通量限制的样品。我们考虑银河纬度|b| > 20度的场,以避免高的HI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。我们最终选择了约3000个有用的区域,覆盖了约400度的总立体角^[2]。我们确定扩展源候选人在软带(0.5-2keV)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,软波段的通量极限为7 E-15 erg/cm ^2/s,logN-logS与以前的深X射线测量非常一致。最后的源列表与已发表的光学、X射线和SZ星团目录相互关联。我们发现,137个来源已被确定为集群,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明确的星系群和星系团的目录,以进行星系团性质的统计研究和宇宙学模型的测试。

英文摘要:

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 to 2012, 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 degree to avoid high HI 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 degree^2. We identify extended source candidates in the soft-band (0.5-2keV) 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 7E-15 erg/cm^2/s 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 SZ catalogs of clusters. We find that 137 sources have been previously identified as clusters, 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.

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