Insight-HXMT insight into switch of the accretion mode: The case of the X-ray pulsar 4U 1901+03
Insight-HXMT insight into switch of the accretion mode: The case of the X-ray pulsar 4U 1901+03
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Insight-HXMT洞察吸积模式的切换：以X射线脉冲星4U 1901 03为例
DOI：
10.1016/j.jheap.2020.03.003
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发表时间：
2020
影响因子：
3.8
通讯作者：
Deng J
中科院分区：
文献类型：
--
作者：
Tuo Y. L.;Ji L.;Tsygankov S. S.;Mihara T.;Song L. M.;Ge M. Y.;Nabizadeh A.;Tao L.;Qu J. L.;Zhang Y.;Zhang S.;Zhang S. N.;Bu Q. C.;Chen L.;Xu Y. P.;Cao X. L.;Chen Y.;Liu C. Z.;Cai C.;Chang Z.;Chen G.;Chen T. X.;Chen Y. B.;Chen Y. P.;Cui W.;Cui W. W.;Deng J
我们使用在2019年爆发期间从X射线脉冲星4U 1901+03收集的Insight-HXMT数据来补充费米/GBM报告的轨道参数。使用Insight-HXMT，我们基于吸积力矩模型检验了固有自旋频率的导数与测辐射热通量之间的相关性。研究发现，在突发过程中，脉冲分布发生了显著的变化。在Insight-HXMT数据中发现的两种剖面模式的存在表明，该源在2019年爆发期间经历了超临界和亚临界吸积体制之间的转换。基于脉冲分布的演化和扭矩模型，我们推导出到4U 1901+03的距离为12.4±0.2kpc。
We use the Insight-HXMT data collected during the 2019 outburst from X-ray pulsar 4U 1901+ 03 to complement the orbital parameters reported by Fermi/GBM. Using the Insight-HXMT, we examine the correlation between the derivative of the intrinsic spin frequency and bolometric flux based on accretion torque models. It was found that the pulse profiles significantly evolve during the outburst. The existence of two types of the profile's pattern discovered in the Insight-HXMT data indicates that this source experienced transition between a super-critical and a sub-critical accretion regimes during its 2019 outburst. Based on the evolution of the pulse profiles and the torque model, we derive the distance to 4U 1901+ 03 as 12.4±0.2 kpc.