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arXiv 0904.3024astro-ph.CO
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X射线源角簇的高精度多波段测量

High-precision multi-band measurements of the angular clustering of X-ray sources

J. Ebrero, S. Mateos, G. C. Stewart, F. J. Carrera, M. G. Watson

摘要:

本文给出了银河系高纬度地区1063个XMM-牛顿观测的X射线源群的两点角相关函数。度,在三个能带中:0.5 - 2(软)、2 - 10(硬)和4.5 - 10(超硬)keV。我们已经测量了我们的调查的角度聚类,并发现显着的正聚类信号在软,硬带,和边缘聚类检测在超硬带。我们发现的集群强度的通量限制的依赖性和高硬度比和低硬度比的源之间的集群属性没有显着差异。我们的研究结果表明,模糊和unobscured对象共享类似的集群属性,因此他们都居住在类似的环境中,与活动星系核的统一模型。我们通过Limber方程解投影角聚类参数来计算它们的典型空间长度。由此我们推断了红移为~1的活动星系核所嵌入的暗物质晕的典型质量。活动星系核的短寿命表明,活动星系核的活动可能是一个短暂的阶段,可以经历几次由大部分星系在其整个生命。

英文摘要:

In this paper we present the two-point angular correlation function of the X-ray source population of 1063 XMM-Newton observations at high Galactic latitudes, comprising up to ~30000 sources over a sky area of 125.5 sq. deg, in three energy bands: 0.5-2 (soft), 2-10 (hard), and 4.5-10 (ultrahard) keV. We have measured the angular clustering of our survey and find significant positive clustering signals in the soft and hard bands, and a marginal clustering detection in the ultrahard band. We find dependency of the clustering strength on the flux limit and no significant differences in the clustering properties between sources with high hardness ratios and those with low hardness ratios. Our results show that obscured and unobscured objects share similar clustering properties and therefore they both reside in similar environments, in agreement with the unified model of AGN. We deprojected the angular clustering parameters via Limber's equation to compute their typical spatial lengths. From that we have inferred the typical mass of the dark matter haloes in which AGN at redshifts of ~1 are embedded. The short AGN lifetimes derived suggest that AGN activity might be a transient phase that can be experienced several times by a large fraction of galaxies throughout their lives.

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