X 射线脉冲星 Cen X-3 的转矩轨道调制

Q1 Earth and Planetary Sciences

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2024-01-17 DOI:10.1093/mnrasl/slae009

Zhenxuan Liao, Jiren Liu

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引用次数: 0

摘要

Cen X-3显示出持续数十天的自旋上升/自旋下降交替现象。我们利用 Fermi/GBM、Swift/BAT 和 MAXI/GSC 监测到的长期数据，研究了 Cen X-3 在自旋上升/自旋下降期间的轨道剖面和光谱。在自旋上升区间，其 2-10 keV 的轨道剖面在轨道相位 0.42 附近对称地达到峰值，而在类似通量和类似自旋变化率大小的自旋下降区间，其轨道剖面在轨道相位 0.22 附近达到峰值，然后逐渐下降。类似通量的自旋上升和自旋下降状态之间如此明显的轨道差异是标准磁盘模型难以解释的，这表明其转矩反转与轨道尺度上的过程有关。自旋上升/自旋下降趋势的持续时间（数十天）也表明存在超轨道变化。一种可能的情况是辐照驱动的翘曲盘不稳定性，它可能产生一个持续数十天的翻转内盘。

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Torque-dependent orbital modulation of X-ray pulsar Cen X-3

Cen X-3shows alternate spin-up/spin-down episodes lasting for tens of days. We study the orbital profiles and spectra of Cen X-3during these spin-up/spin-down intervals, using long-term data monitored by Fermi/GBM, Swift/BAT and MAXI/GSC. In spin-up intervals, its orbital profile in 2–10 keV is symmetrically peaked around orbital phase 0.42, while in spin-down intervals of similar fluxes and similar magnitudes of spin change rate, its profile reaches a peak around orbital phase 0.22 and then declines gradually. Such a distinct orbital difference between spin-up and spin-down states of similar flux is hard to explain in the standard disk model and indicates that its torque reversals are related to processes on the orbital scale. The durations of continuous spin-up/spin-down trend (tens of days) also point to a superorbital variation. One possible scenario is the irradiation-driven warping disk instability, which may produce a flipped inner disk for tens of days.

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来源期刊

Monthly Notices of the Royal Astronomical Society: Letters Earth and Planetary Sciences-Space and Planetary Science

CiteScore

8.80

自引率

0.00%

发文量

136

期刊介绍： For papers that merit urgent publication, MNRAS Letters, the online section of Monthly Notices of the Royal Astronomical Society, publishes short, topical and significant research in all fields of astronomy. Letters should be self-contained and describe the results of an original study whose rapid publication might be expected to have a significant influence on the subsequent development of research in the associated subject area. The 5-page limit must be respected. Authors are required to state their reasons for seeking publication in the form of a Letter when submitting their manuscript.