COSMOS字段中的X射线源计数
X-ray source counts in the COSMOS field
摘要：
我们提出的XMM-COSMOS调查中的源计数的分析使用的第一年的XMM-Newton观测的数据。巡天覆盖了以9^h57.5^m<R. A为界的天空区域内的~2度^2。<10^h03.5^m; 1^d27.5^m<DEC<2^d57.5^m，总净积分时间为504 ks。使用极大似然算法，我们检测到至少在一个波段共1390个源。利用蒙特卡罗模拟估计天空覆盖，我们产生了logN-logS关系。然后，在0.5- 2 keV、2- 10 keV和5- 10 keV的能带中推导出了这些关系式，通量极限分别为7.2x10^-16 erg cm^-2 s^-1、4.0x10^-15 erg cm^-2 s^-1和9.7x10^-15 erg cm^-2 s^-1。这些关系已被比较，以前的X射线调查和最近的X射线背景模型发现一个很好的协议。在COSMOS和以前的调查中观察到的源计数的略微不同的归一化可以在很大程度上解释为低计数统计和由大尺度结构引入的宇宙方差的组合。
英文摘要：
We present the analysis of the source counts in the XMM-COSMOS survey using data of the first year of XMM-Newton observations. The survey covers ~2 deg^2 within the region of sky bounded by 9^h57.5^m<R.A.<10^h03.5^m; 1^d27.5^m<DEC<2^d57.5^m with a total net integration time of 504 ks. Using a maximum likelihood algorithm we detected a total of 1390 sources at least in one band. Using Monte Carlo simulations to estimate the sky coverage we produced the logN-logS relations. These relations have been then derived in the 0.5--2 keV, 2--10 keV and 5--10 keV energy bands, down to flux limits of 7.2x10^-16 erg cm^-2 s^-1, 4.0x10^-15 erg cm^-2 s^-1 and 9.7x10^-15 erg cm^-2 s^-1, respectively. These relations have been compared to previous X-ray survey and to the most recent X-ray background model finding an excellent agreement. The slightly different normalizations observed in the source counts of COSMOS and previous surveys can be largely explained as a combination of low counting statistics and cosmic variance introduced by the large scale structure.
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