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arXiv 1809.04738astro-ph.HE
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XTE J1810-197中的可变吸收线

Variable Absorption Line in XTE J1810-197

Eda Vurgun, Manoneeta Chakraborty, Tolga Güver, Ersin Göğüş

摘要:

我们报告了对第一颗瞬变磁星XTE J1810-197的长期光谱和时间研究结果,该磁星是在2003年发现的,当时它的X射线光度增加了100倍。我们使用双组分黑体模型拟合所有存档X射线观测的X射线光谱,其中冷组分最有可能源自中子星的整个表面,热组分来自小得多的热点。我们通过跟踪表面温度、表观发射面积和脉冲分数来研究表面发射特性的长期演化。我们评估的脉冲分数在两个能量区间(<1.5 keV and >1.5千电子伏),并表明,XTE J1810-197表现出略高的脉冲发射能量高于1.5千电子伏。我们探讨的吸收线检测到1.1千电子伏左右的特性。我们发现,吸收特性是高度可变的,它的轮廓是不对称的。为了准确地表示这个特征,我们引入了不对称高斯分布,并量化了吸收特征的不对称程度。

英文摘要:

We report the results of a long-term spectral and timing study of the first transient magnetar, XTE J1810-197 which was discovered in 2003 when its X-ray luminosity increased 100 fold. We fit X-ray spectra of all archival X-ray observations using a two-component blackbody model, where the cool component is most likely originating from the whole surface of the neutron star and the hot component is from a much smaller hot spot. We investigate the long-term evolution of the surface emission characteristics via tracing its surface temperature, apparent emitting area and the pulsed fraction. We evaluate the pulsed fraction in two energy intervals (<1.5 keV and >1.5 keV) and show that the XTE J1810-197 exhibits slightly higher pulsed emission at energies above 1.5 keV. We explore the characteristics of an absorption line detected around 1.1 keV. We find that the absorption feature is highly variable and its profile is asymmetric. To accurately represent this feature, we introduced an asymmetric Gaussian profile and quantified the level of asymmetry of the absorption feature.

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