Log-Gaussian Distribution and Evolution of Minimum Variation Timescales for SGR J1550-5418

被引：3

作者：

Xiao, Shuo ^{[1
,2
]}

Zhang, Yan-Ting ^{[3
]}

Yang, Jiao-Jiao ^{[1
,2
]}

Hong, Mei-Xin ^{[1
,2
]}

Liao, Tong-Lei ^{[1
,2
]}

Luo, Xi-Hong ^{[4
]}

机构：

[1] Guizhou Normal Univ, Sch Phys & Elect Sci, Guiyang 550001, Peoples R China

[2] Guizhou Normal Univ, Guizhou Prov Key Lab Radio Astron & Data Proc, Guiyang 550001, Peoples R China

[3] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China

[4] Chongqing Univ, Dept Phys, Chongqing 400044, Peoples R China

来源：

ASTROPHYSICAL JOURNAL | 2024年 / 967卷 / 02期

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

BURST; VARIABILITY; MAGNETAR; DISCOVERY; EMISSION;

D O I：

10.3847/1538-4357/ad43e0

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The major observation of the X-ray burst (XRB) in association with the fast radio burst (FRB) FRB 200428 originating from SGR J1935+2154 on 2020 April 28 substantiates magnetars as one of the origins of FRBs. However, it is still unclear why only a few XRBs in association with FRBs have been observed solely in this magnetar. In this study, we investigate the minimum variation timescales (MVTs) of XRBs from SGR J1550-5418, an active magnetar similar to SGR J1935+2154, and conduct a comprehensive comparison of their MVT properties. Our analysis reveals that the distribution of the MVT for SGR J1550-5418 follows a lognormal Gaussian function with the mean 6.4 +/- 0.4 ms. Interestingly, we detect an evolution in the MVTs, i.e., the fitted mean of the MVT distribution in 2008 October is about 3 times larger than that in 2009, indicating potential variations in radiation regions possibly attributed to changes in magnetic field topology. Besides, we do not find a significant correlation between the MVT and either duration or energy. Finally, there is no significant difference between the MVT distributions across different energy ranges for SGR J1550-5418 and SGR J1935+2154, which supports a common physical origin.

引用

页数：11

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