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arXiv 2005.14555astro-ph.HE
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基于Insight-HXMT和NuSTAR观测的X射线脉冲星4U 1901+03在2019年爆发期间的光谱演化

Spectral evolution of X-ray pulsar 4U 1901+03 during the 2019 outburst based on Insight-HXMT and NuSTAR observations

Armin Nabizadeh, Sergey S. Tsygankov, Long Ji, Victor Doroshenko, Sergey V. Molkov, Youli Tuo, Shuang-Nan Zhang, Fan-Jun Lu, Shu Zhang, Juri Poutanen

摘要:

我们报告了X射线脉冲星4U 1901+03发射的详细光谱分析,使用了Insight-HXMT和NuSTAR天文台在2019年爆发期间获得的数据。由于Insight-HXMT对爆发的广泛覆盖,我们能够研究源的光谱演化作为通量的函数,并将这些结果与以前的报告进行比较,重点关注10 keV左右的假定吸收特征的性质。特别是,我们证明了宽带X射线连续的4U 1901+03可以很好地描述与两个组件的连续模型没有吸收线在10 keV,这使人怀疑其解释为回旋线。高质量的数据也使我们能够进行相位平均和相位分辨光谱分析作为光度的函数。最后,我们进行了一个详细的调查的另一个吸收功能的频谱中的源约30千电子伏最近报告的NuSTAR数据。我们表明,这一功能似乎显着检测相位平均和相位分辨光谱,无论连续模型。

英文摘要:

We report on a detailed spectral analysis of emission from X-ray pulsar 4U 1901+03 using data obtained by the Insight-HXMT and NuSTAR observatories during the 2019 outburst of the source. Thanks to the extensive coverage of the outburst by Insight-HXMT, we were able to investigate the spectral evolution of the source as a function of flux, and compare these results to the previous reports, focusing on the properties of a putative absorption feature at around 10 keV. In particular, we demonstrate that the broadband X-ray continuum of 4U 1901+03 can be well described with a two-component continuum model without an absorption line at 10 keV, which casts doubt on its interpretation as a cyclotron line. The high quality of the data also allowed us to perform both phase-averaged and phase-resolved spectral analyses as a function of luminosity. Finally, we performed a detailed investigation of another absorption feature in the spectrum of the source around 30 keV recently reported in the NuSTAR data. We show that this feature appears to be significantly detected both in phase-averaged and phase-resolved spectra irrespective of the continuum model.

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