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arXiv 2302.02167astro-ph.HE
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用Insight-HXMT观测到的EXO 2030+375 2021年大爆发的时间分析

Timing analysis of EXO 2030+375 during its 2021 giant outburst observed with Insight-HXMT

Yu-Cong Fu, L. M. Song, G. Q. Ding, M. Y. Ge, Y. L. Tuo, S. Zhang, S. N. Zhang, X. Hou, J. L. Qu, J. Zhang, L. Zhang, Q. C. Bu, Y. Huang, X. Ma, X. Zhou, W. M. … 展开作者

Yu-Cong Fu, L. M. Song, G. Q. Ding, M. Y. Ge, Y. L. Tuo, S. Zhang, S. N. Zhang, X. Hou, J. L. Qu, J. Zhang, L. Zhang, Q. C. Bu, Y. Huang, X. Ma, X. Zhou, W. M. Yan, Z. X. Yang, X. F. Lu, T. M. Li, Y. C. Xu, P. J. Wang, S. H. Xiao, H. X. Liu, X. Q. Ren, Y. F. Du, Q. X. zhao, Y. X. Xiao

摘要:

利用\textit{Insight} -HXMT观测资料,报道了EXO 2030+375在2021年爆发期间的X射线脉动演化。基于吸积矩模型,我们研究了自旋频率导数与光度之间的关联。在1- 160 keV的能带中可以检测到脉动。在爆发过程中,脉冲轮廓随光度变化显著,导致整个爆发可分为几个具有不同特征的部分。脉冲轮廓的演变揭示了超临界(扇形束为主)和亚临界吸积(扇形束为主)模式之间的过渡。根据吸积力矩模型和临界光度模型,基于7.1 kpc的距离,推断的磁场分别为$(0.41-0.74) \times 10^{12}$ G和$(3.48-3.96) \times 10^{12}$ G,或者基于3.6 kpc的距离,估计的磁场分别为$(2.4-4.3) \times 10^{13}$ G和$(0.98-1.11)\times 10^{12}$ G。两组不同的磁场均支持NS的多极磁场的存在。

英文摘要:

We report the evolution of the X-ray pulsations of EXO 2030+375 during its 2021 outburst using the observations from \textit{Insight}-HXMT. Based on the accretion torque model, we study the correlation between the spin frequency derivatives and the luminosity. Pulsations can be detected in the energy band of 1--160 keV. The pulse profile evolves significantly with luminosity during the outburst, leading to that the whole outburst can be divided into several parts with different characteristics. The evolution of the pulse profile reveals the transition between the super-critical (fan-beam dominated) and the sub-critical accretion (pencil-beam dominated) mode. From the accretion torque model and the critical luminosity model, based on a distance of 7.1 kpc, the inferred magnetic fields are $(0.41-0.74) \times 10^{12}$ G and $(3.48-3.96) \times 10^{12}$ G, respectively, or based on a distance of 3.6 kpc, the estimated magnetic fields are $(2.4-4.3) \times 10^{13}$ G and $(0.98-1.11)\times 10^{12}$ G, respectively. Two different sets of magnetic fields both support the presence of multipole magnetic fields of the NS.

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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