Scale-invariant Features of X-Ray Bursts from SGR J1935+2154 Detected by Insight-HXMT

IF 3.3 3区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
Xiu-Juan Li, Jia-Mu Liu, Ming Cheng, Yan-Na Wang, Wen-Long Zhang
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Abstract

In this work, we restudy the scale-invariant features of X-ray bursts from the soft gamma repeater (SGR) J1935+2154. To compare with previous studies, we choose 75 bursts from a dedicated 33 days-long observation carried out by Insight-HXMT. We investigate the size difference distributions of net counts, duration, and waiting time. It is found that the cumulative difference distributions of net counts and duration follow the q-Gaussian models with approximately steady q-values, confirming that the scale-invariant features exist in X-ray bursts of SGR J1935+2154. Regarding the varying results of waiting time reported by Sang & Lin and Wei et al, we find that the distributions of waiting time can be well described by the q-Gaussian model. Furthermore, the q-values of waiting time remain relatively stable at the 3σ confidence level, corroborating the scale invariance in the X-ray bursts. Additionally, we note that there is no significant q-value evolution across three Insight-HXMT telescopes. These findings statistically affirm that the X-ray bursts from SGR J1935+2154 can be attributed to an fractal-diffusive self-organized criticality system with a plausible Euclidean spatial dimension S = 3, implying that X-ray bursts from SGR J1935+2154 and associated astrophysical phenomena may share a similar magnetically dominated stochastic process.
Insight-HXMT探测到的来自SGR J1935+2154的X射线暴的尺度不变特征
在这项工作中,我们重新研究了来自软伽马中继器(SGR)J1935+2154 的 X 射线暴的尺度不变特征。为了与以前的研究进行比较,我们从 Insight-HXMT 进行的长达 33 天的专门观测中选择了 75 个脉冲串。我们研究了净计数、持续时间和等待时间的大小差异分布。结果发现,净计数和持续时间的累积差分布遵循q-高斯模型,q值近似稳定,这证实了SGR J1935+2154的X射线暴存在尺度不变的特征。关于Sang & Lin和Wei等人报告的等待时间的不同结果,我们发现q-高斯模型可以很好地描述等待时间的分布。此外,等待时间的q值在3σ置信水平下保持相对稳定,这证实了X射线暴的尺度不变性。此外,我们还注意到,Insight-HXMT 三台望远镜的 q 值没有明显的变化。这些发现从统计学上肯定了来自 SGR J1935+2154 的 X 射线暴可以归因于一个分形扩散自组织临界系统,其可信的欧几里得空间维度为 S = 3,这意味着来自 SGR J1935+2154 的 X 射线暴和相关的天体物理现象可能具有类似的磁主导随机过程。
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来源期刊
Publications of the Astronomical Society of the Pacific
Publications of the Astronomical Society of the Pacific 地学天文-天文与天体物理
CiteScore
6.70
自引率
5.70%
发文量
103
审稿时长
4-8 weeks
期刊介绍: The Publications of the Astronomical Society of the Pacific (PASP), the technical journal of the Astronomical Society of the Pacific (ASP), has been published regularly since 1889, and is an integral part of the ASP''s mission to advance the science of astronomy and disseminate astronomical information. The journal provides an outlet for astronomical results of a scientific nature and serves to keep readers in touch with current astronomical research. It contains refereed research and instrumentation articles, invited and contributed reviews, tutorials, and dissertation summaries.
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