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arXiv 0711.4822astro-ph
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洛克曼洞的XMM-牛顿观测:X射线源目录和计数

XMM-Newton observations of the Lockman Hole: X-ray source catalogue and number counts

H. Brunner, N. Cappelluti, G. Hasinger, X. Barcons, A. C. Fabian, V. Mainieri, G. Szokoly

摘要:

洛克曼黑洞场代表银河系视线柱密度最低的天区,N_H= 5.7 × 10^19 cm^-2。XMM-牛顿X射线天文台在18个点观测到它,总共1.16 Msec(原始EPIC pn观测时间),构成迄今为止最深的XMM-牛顿曝光。我们提出了一个在中心0.196度^2区域探测到的X射线源的目录,并讨论了由此导出的计数和X射线颜色。在0.5- 2.0 keV波段,灵敏度极限(定义为最微弱的可探测源)达到了1.9 × 10 ^-16 erg cm^-2 s^-1。2.0- 10.0 keV波段和5.0- 10.0 keV波段的灵敏度极限分别为9 × 10 ^-16 erg cm^-2 s^-1和1.8 × 10 ^-15 erg cm^-2 s^-1。(3.9 σ),其中340、266和98个源分别在软、硬和非常硬的带中被检测到。每个能带的计数与以前的调查结果和X射线背景的合成模型非常一致。从X射线色图中选出了6%的康普顿厚源候选者。这一部分是一致的X射线背景人口合成模型在我们的通量限制的最新预测。我们还首次估计了康普顿厚活动星系核的logN-logS关系。

英文摘要:

The Lockman Hole field represents the sky area of lowest Galactic line-of-sight column density N_H=5.7X10^19 cm^-2. It was observed by the XMM-Newton X-ray observatory in 18 pointings for a total of 1.16 Msec (raw EPIC pn observing time) constituting the deepest XMM-Newton exposure so far. We present a catalogue of the X-ray sources detected in the central 0.196 deg^2 of the field and discuss the derived number counts and X-ray colours. In the 0.5--2.0 keV band, a sensitivity limit (defined as the faintest detectable source)of 1.9X10^-16 erg cm^-2 s^-1 was reached. The 2.0--10.0 keV band and 5.0--10.0 keV band sensitivity limits were 9X10^-16 erg cm^-2 s^-1 and 1.8X10^-15 erg cm^-2 s^-1, respectively.A total of 409 sources above a detection likelihood of 10 (3.9 sigma) were found within a radius of 15' off the field centre, of which 340, 266, and 98 sources were detected in the soft, hard, and very hard bands, respectively. The number counts in each energy band are in close agreement with results from previous surveys and with the synthesis models of the X-ray background. A 6% of Compton-thick source candidates have been selected from the X-ray colour-colour diagram. This fraction is consistent with the most recent predictions of X-ray background population synthesis models at our flux limits. We also estimated, for the first time, the logN-logS relation for Compton-thick AGN.

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