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arXiv 1010.0677astro-ph.CO
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XMM聚类调查:X射线分析方法

The XMM Cluster Survey: X-ray analysis methodology

E. J. Lloyd-Davies, A. Kathy Romer, Nicola Mehrtens, Mark Hosmer, Michael Davidson, Kivanc Sabirli, Robert G. Mann, Matt Hilton, Andrew R. Liddle, Pedro T. P. V… 展开作者

E. J. Lloyd-Davies, A. Kathy Romer, Nicola Mehrtens, Mark Hosmer, Michael Davidson, Kivanc Sabirli, Robert G. Mann, Matt Hilton, Andrew R. Liddle, Pedro T. P. Viana, Heather C. Campbell, Chris A. Collins, E. Naomi Dubois, Peter Freeman, Craig D. Harrison, Ben Hoyle, Scott T. Kay, Emma Kuwertz, Christopher J. Miller, Robert C. Nichol, Martin Sahlen, S. A. Stanford, John P. Stott

摘要:

XMM星系团巡天(XCS)是利用XMM-牛顿科学档案中所有公开可用的数据对星系团进行的偶然搜索。其主要目的是测量宇宙学参数和追踪X射线标度关系的演化。在本文中,我们描述的数据处理方法应用于5,776 XMM观测用于构建当前XCS源目录。从适合于410度^2的聚类搜索的总非重叠区域中提取了总共3,675个具有> 50个减去背景的X射线计数的> 4西格玛聚类候选。其中,993名候选人检测到> 300背景扣除X射线光子计数,我们证明,可以获得强大的温度测量下降到这个计数限制。我们详细描述了用于执行这些候选人的光谱和表面亮度拟合,以及估计从单独的X射线数据的红移的自动流水线。迄今为止,共测量了587(122)个X射线温度,其典型精度<40%(<10%)。我们还提出了用于确定调查的选择函数所采用的方法,并表明扩展的源检测算法是强大的集群形态的范围内插入模拟集群来自流体动力学模拟到真正的XMM图像。这些测试表明,简单的等温β-配置文件是足够的,以捕捉在档案XMM观测中检测到的集群人口的基本细节。XCS星系团样本的红移后续研究在一篇配套论文中提出,同时还有503个光学确认的星系团的第一次数据发布。

英文摘要:

The XMM Cluster Survey (XCS) is a serendipitous search for galaxy clusters using all publicly available data in the XMM-Newton Science Archive. Its main aims are to measure cosmological parameters and trace the evolution of X-ray scaling relations. In this paper we describe the data processing methodology applied to the 5,776 XMM observations used to construct the current XCS source catalogue. A total of 3,675 > 4-sigma cluster candidates with > 50 background-subtracted X-ray counts are extracted from a total non-overlapping area suitable for cluster searching of 410 deg^2. Of these, 993 candidates are detected with > 300 background-subtracted X-ray photon counts, and we demonstrate that robust temperature measurements can be obtained down to this count limit. We describe in detail the automated pipelines used to perform the spectral and surface brightness fitting for these candidates, as well as to estimate redshifts from the X-ray data alone. A total of 587 (122) X-ray temperatures to a typical accuracy of < 40 (< 10) per cent have been measured to date. We also present the methodology adopted for determining the selection function of the survey, and show that the extended source detection algorithm is robust to a range of cluster morphologies by inserting mock clusters derived from hydrodynamical simulations into real XMM images. These tests show that the simple isothermal beta-profiles is sufficient to capture the essential details of the cluster population detected in the archival XMM observations. The redshift follow-up of the XCS cluster sample is presented in a companion paper, together with a first data release of 503 optically-confirmed clusters.

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