X-ray reprocessing in accreting pulsar GX 301-2 observed with Insight-HXMT

X-ray reprocessing in accreting pulsar GX 301-2 observed with Insight-HXMT
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使用 Insight-HXMT 观测到的吸积脉冲星 GX 301-2 的 X 射线再处理

DOI:
10.1093/mnras/staa3788
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发表时间:
2020-12
影响因子:
4.8
通讯作者:
et al.
et al.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Ji L.;Doroshenko V.;Suleimanov V.;et al.

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我们研究了2017-2019年用Insight-HXMT/LE探测到的GX 301-2的吸收和发射特征。在不同的轨道相,我们发现了显著的Fe Kalpha、Kbeta和Ni Kalpha谱线,以及康普顿肩和Fe K壳层吸收边。这些特征是由于来自源的辐射与周围吸积物质之间的相互作用而引起的X射线再处理。根据铁线Kα和Kβ的比值,我们推断吸积物质处于低电离态。我们发现了一个与轨道有关的局域吸收柱密度,它在近星附近有一个很大的值和很强的变异性。我们将其变异性解释为吸积环境的不均质性和/或吸积过程的不稳定性的结果。此外,变化的局部柱密度与整个轨道上铁卡尔法线的等效宽度相关,这表明中子星附近的吸积物质是球状分布的。
We investigate the absorption and emission features in observations of GX 301-2 detected with Insight-HXMT/LE in 2017-2019. At different orbital phases, we found prominent Fe Kalpha, Kbeta and Ni Kalpha lines, as well as Compton shoulders and Fe K-shell absorption edges. These features are due to the X-ray reprocessing caused by the interaction between the radiation from the source and surrounding accretion material. According to the ratio of iron lines Kalpha and Kbeta, we infer the accretion material is in a low ionisation state. We find an orbital-dependent local absorption column density, which has a large value and strong variability around the periastron. We explain its variability as a result of inhomogeneities of the accretion environment and/or instabilities of accretion processes. In addition, the variable local column density is correlated with the equivalent width of the iron Kalpha lines throughout the orbit, which suggests that the accretion material near the neutron star is spherically distributed.
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