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arXiv 1402.2350astro-ph.HE
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中子星低质量X射线双星4U 1636-53的XMM-牛顿谱和朱雀谱中的铁线和连续谱变化

Iron-line and continuum variations in the XMM-Newton and Suzaku spectra of the neutron-star low-mass X-ray binary 4U 1636-53

Ming Lyu, Mariano Mendez, Andrea Sanna, Jeroen Homan, Tomaso Belloni, Beike Hiemstra

摘要:

我们使用了6个同步的XMM-牛顿和罗西X射线定时探测器加上5个朱雀观测,研究了中子星低质量X射线双星4U 1636-53的连续谱和铁发射线。我们建模的光谱与两个热组件(代表吸积盘和边界层),Comptonised组件(代表一个热电晕),以及高斯或相对论线组件,以模拟铁发射线在约6.5千电子伏。对于相对论性线分量,我们使用了盘线,laor或kyrline模型,后者适用于三个不同的自旋参数值。连续体的拟合结果与标准截断圆盘的情况一致。我们还发现,磁通量和等效宽度的铁线先增加,然后减少的康普顿分量的磁通量的增加。这可以通过吸积盘电离状态的变化来解释,其中该线是由反射产生的,或者如果该分量产生的高度随着质量吸积率而变化,则可以通过来自康普顿分量的发射的光弯曲来解释。

英文摘要:

We used six simultaneous XMM-Newton and Rossi X-ray Timing Explorer plus five Suzaku observations to study the continuum spectrum and the iron emission line in the neutron-star low-mass X-ray binary 4U 1636-53. We modelled the spectra with two thermal components (representing the accretion disc and boundary layer), a Comptonised component (representing a hot corona), and either a Gaussian or a relativistic line component to model an iron emission line at about 6.5 keV. For the relativistic line component we used either the diskline, laor or kyrline model, the latter for three different values of the spin parameter. The fitting results for the continuum are consistent with the standard truncated disc scenario. We also find that the flux and equivalent width of the iron line first increase and then decrease as the flux of the Comptonised component increases. This could be explained either by changes in the ionisation state of the accretion disc where the line is produced by reflection, or by light bending of the emission from the Comptonised component if the height at which this component is produced changes with mass accretion rate.

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