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arXiv 1005.3755astro-ph.HE
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中子星LMXBs中宽Fe K α线的XMM-牛顿系统分析

A systematic analysis of the broad Fe Kalpha line in neutron star LMXBs with XMM-Newton

C. Ng, M. Diaz Trigo, M. Cadolle Bel, S. Migliari

摘要:

分析了16颗中子星(NS)低质量X射线双星(LMXB)的XMM-牛顿观测资料,研究了这些天体的Fe-K辐射。该样本包括在EPIC pn定时模式下使用XMM-Newton进行的NS LMXB的所有观测,直到2009年9月30日公开。我们进行了详细的数据分析,考虑堆积和背景效应。由于不正确的堆积校正或不同的连续参数化,铁线的性质不同于以前发表的分析。80%的观察,其中光谱可以提取显示出显着的Fe线发射。我们发现了一个平均线质心为6.67 $\pm$ 0.02 keV和一个有限的宽度,$σ$,0.33 $\pm$ 0.02 keV。线的等效宽度在17和189 eV之间变化,平均加权值为42 $\pm$ eV。对于有几个观测结果的来源,Fe线参数在观测结果之间发生变化时,连续谱发生显着变化。谱线参数与光度无相关性。最重要的是,我们可以用一个简单的高斯分量来拟合所有源的Fe线。这些线没有显示不对称的轮廓,在以前的分析中,这些LMXB被解释为相对论效应的指示。

英文摘要:

We analysed the XMM-Newton archival observations of 16 neutron star (NS) low-mass X-ray binaries (LMXBs) to study the Fe K emission in these objects. The sample includes all the observations of NS LMXBs performed in EPIC pn Timing mode with XMM-Newton publicly available until September 30, 2009. We performed a detailed data analysis considering pile-up and background effects. The properties of the iron lines differed from previous published analyses due to either incorrect pile-up corrections or different continuum parameterization. 80% of the observations for which a spectrum can be extracted showed significant Fe line emission. We found an average line centroid of 6.67 $\pm$ 0.02 keV and a finite width, $σ$, of 0.33 $\pm$ 0.02 keV. The equivalent width of the lines varied between 17 and 189 eV, with an average weighted value of 42 $\pm$ eV. For sources where several observations were available the Fe line parameters changed between observations whenever the continuum changed significantly. The line parameters did not show any correlation with luminosity. Most important, we could fit the Fe line with a simple Gaussian component for all the sources. The lines did not show the asymmetric profiles that were interpreted as an indication of relativistic effects in previous analyses of these LMXBs.

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