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arXiv 2103.16757astro-ph.HE
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X射线脉冲星GX 301-2中的盘与风吸积

Disk vs wind accretion in X-ray pulsar GX 301-2

Jiren Liu, Long Ji, Peter A. Jenke, Victor Doroshenko, Zhenxuan Liao, Xiaobo Li, Shuangnan Zhang, Mauro Orlandini, Mingyu Ge, Shu Zhang, Andrea Santangelo

摘要:

GX 301-2提供了一个难得的机会来研究同一目标中的盘和风吸积。我们报告了2019年发生的GX 301-2自旋上升事件的Insight-HXMT观测结果,并与风馈状态的结果进行了比较。在初始的快速自旋阶段,脉冲波形由一个主峰主导,而在后期的缓慢自旋阶段,脉冲波形由两个类似的峰组成,这些峰与风馈状态下的脉冲波形相似。Fermi/GBM数据也证实了这一现象,在快速自旋上升期间,主峰随亮度的增加而增加,直到$8\times10^{37}$ erg s $^{-1}$,而弱峰几乎保持不变。在自旋上升期间的吸收柱密度为$\sim1.5\times10^{23}$ cm $^{-2}$,远小于在相似光度下的风馈状态的吸收柱密度($\sim9\times10^{23}$ cm $^{-2}$),支持在自旋上升期间大部分物质凝聚成盘的假设。我们讨论了可能的差异盘和风吸积,可以解释所观察到的不同趋势的脉冲轮廓。

英文摘要:

GX 301-2 provides a rare opportunity to study both disk and wind accretion in a same target. We report Insight-HXMT observations of the spin-up event of GX 301-2 happened in 2019 and compare with those of wind-fed state. The pulse profiles of the initial rapid spin-up period are dominated by one main peak, while those of the later slow spin-up period are composed of two similar peaks, as those of wind-fed state. These behaviors are confirmed by Fermi/GBM data, which also show that during the rapid spin-up period, the main peak increases with luminosity up to $8\times10^{37}$ erg s$^{-1}$, but the faint peak keeps almost constant. The absorption column densities during the spin-up period are $\sim1.5\times10^{23}$ cm$^{-2}$, much less than those of wind-fed state at similar luminosity ($\sim9\times10^{23}$ cm$^{-2}$), supporting the scenario that most of material is condensed into a disk during the spin-up period. We discuss possible differences between disk and wind accretion that may explain the observed different trend of pulse profiles.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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