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arXiv 2310.06299astro-ph.HE
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“慧眼”硬X射线调制望远镜(Insight-HXMT)探测到的SGR J1935+2154 X射线暴的统计特性

Statistical Properties of X-Ray Bursts from SGR J1935+2154 Detected by Insight-HXMT

Wen-Long Zhang, Xiu-Juan Li, Yu-Peng Yang, Shuang-Xi Yi, Cheng-Kui Li, Qing-Wen Tang, Ying Qin, Fa-Yin Wang

AI总结:

本研究利用幂律模型拟合磁星SGR J1935+2154的75次X射线暴参数的累积分布,证实其符合自组织临界性特征且无明显能段演化,支持磁重联触发X射线暴的假说。

摘要:

作为宇宙中最重要的一类天体,磁星能够产生包括X射线暴在内的多种不同频率的爆发。文献[2022ApJS..260...24C]公布了磁星SGR J1935+2154在2020年一个活动期内产生的75次X射线暴,包含每次暴的持续时间、净光子计数,以及基于触发时间差得到的等待时间。本文采用幂律模型$dN(x)/dx\propto (x+x_0)^{-α_x}$拟合这些参数的累积分布,结果显示所有累积分布都能被很好地拟合,这一现象可用自组织临界性理论解释。此外,我们检验了该现象在不同能段是否仍然存在,发现没有明显的演化。这些发现进一步证实磁星的X射线暴很可能由某种自组织临界过程产生,可通过磁星中可能存在的磁重联场景来解释。

英文摘要:

As one class of the most important objects in the universe, magnetars can produce a lot of different frequency bursts including X-ray bursts. In \cite{2022ApJS..260...24C}, 75 X-ray bursts produced by magnetar SGR J1935+2154 during an active period in 2020 are published, including the duration and net photon counts of each burst, and waiting time based on the trigger time difference. In this paper, we utilize the power-law model, $dN(x)/dx\propto (x+x_0)^{-α_x}$, to fit the cumulative distributions of these parameters. It can be found that all the cumulative distributions can be well fitted, which can be interpreted by a self-organizing criticality theory. Furthermore, we check whether this phenomenon still exist in different energy bands and find that there is no obvious evolution. These findings further confirm that the X-ray bursts from magnetars are likely to be generated by some self-organizing critical process, which can be explained by a possible magnetic reconnection scenario in magnetars.

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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