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arXiv 1303.4306astro-ph.HE
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星暴星系M83 X射线源布居的XMM-Newton研究

X-ray source population study of the starburst galaxy M83 with XMM-Newton

L. Ducci, M. Sasaki, F. Haberl, W. Pietsch

摘要:

本文给出了M83的三个XMM-牛顿观测的分析结果。本文的目的是研究M83中的X射线源布居,并计算星系不同区域的X射线双星的X射线光度函数。我们在0.2-12 keV的能量范围内检测到189个XMM-牛顿视场中的源。我们通过光谱分析、硬度比、对X射线可变性的研究,以及与X射线、光学、红外和无线电波长目录的互相关来限制它们的性质。我们识别并分类了12个背景天体,5个前景恒星,2个X射线双星,1个超新星遗迹候选者,1个超软源候选者和1个超亮X射线源。在这些来源中,我们首次分类的三个活动星系核(AGN)的候选人。我们导出了M83中X射线源的X射线光度函数,在2-10 keV能量范围内,在D_25椭圆之内和之外,校正了总的X射线光度函数的不完整性,并减去活动星系核的贡献。D_25椭圆内部的X射线光度函数与钱德拉以前观测到的一致。Kolmogorov-Smirnov检验表明外盘X射线光度函数与活动星系核光度分布不相关的概率约为99.3%。我们还发现,在D_25椭圆外探测到的X射线源与活动星系核的均匀空间分布在空间上不相关,显著性达99.5%。我们解释这些结果作为一个迹象,部分观测到的X射线源的X射线双星在外盘的M83。

英文摘要:

We present the results obtained from the analysis of three XMM-Newton observations of M83. The aims of the paper are studying the X-ray source populations in M83 and calculating the X-ray luminosity functions of X-ray binaries for different regions of the galaxy. We detected 189 sources in the XMM-Newton field of view in the energy range of 0.2-12 keV. We constrained their nature by means of spectral analysis, hardness ratios, studies of the X-ray variability, and cross-correlations with catalogues in X-ray, optical, infrared, and radio wavelengths. We identified and classified 12 background objects, five foreground stars, two X-ray binaries, one supernova remnant candidate, one super-soft source candidate and one ultra-luminous X-ray source. Among these sources, we classified for the first time three active galactic nuclei (AGN) candidates. We derived X-ray luminosity functions of the X-ray sources in M83 in the 2-10 keV energy range, within and outside the D_25 ellipse, correcting the total X-ray luminosity function for incompleteness and subtracting the AGN contribution. The X-ray luminosity function inside the D_25 ellipse is consistent with that previously observed by Chandra. The Kolmogorov-Smirnov test shows that the X-ray luminosity function of the outer disc and the AGN luminosity distribution are uncorrelated with a probability of about 99.3%. We also found that the X-ray sources detected outside the D_25 ellipse and the uniform spatial distribution of AGNs are spatially uncorrelated with a significance of 99.5%. We interpret these results as an indication that part of the observed X-ray sources are X-ray binaries in the outer disc of M83.

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