Academic Journal
The Minimum Variation Timescales of X-Ray Bursts from SGR J1935+2154
| Title: | The Minimum Variation Timescales of X-Ray Bursts from SGR J1935+2154 |
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| Authors: | Shuo Xiao, Jiao-Jiao Yang, Xi-Hong Luo, Shao-Lin Xiong, Yuan-Hong Qu, Shuang-Nan Zhang, Wang-Chen Xue, Xiao-Bo Li, You-Li Tuo, Ai-Jun Dong, Ru-Shuang Zhao, Shi-Jun Dang, Lun-Hua Shang, Qing-Bo Ma, Ce Cai, Jin Wang, Ping Wang, Cheng-Kui Li, Shu-Xu Yi, Zhen Zhang, Ming-Yu Ge, Shi-Jie Zheng, Li-Ming Song, Wen-Xi Peng, Xiang-Yang Wen, Xin-Qiao Li, Zheng-Hua An, Xin Xu, Yue Wang, Chao Zheng, Yan-Qiu Zhang, Jia-Cong Liu, Bin Zhang, Wei Xie, Jian-Chao Feng, De-Hua Wang, Qi-Jun Zhi |
| Source: | The Astrophysical Journal Supplement Series, Vol 268, Iss 1, p 5 (2023) |
| Publisher Information: | IOP Publishing, 2023. |
| Publication Year: | 2023 |
| Collection: | LCC:Astrophysics |
| Subject Terms: | Magnetars, Astrophysics, QB460-466 |
| More Details: | The minimum variation timescale (MVT) of soft gamma-ray repeaters can be an important probe to estimate the emission region in pulsar-like models, as well as the Lorentz factor and radius of the possible relativistic jet in gamma-ray burst (GRB)–like models, thus revealing their progenitors and physical mechanisms. In this work, we systematically study the MVTs of hundreds of X-ray bursts (XRBs) from SGR J1935+2154 observed by Insight-HXMT, GECAM, and Fermi/Gamma-ray Burst Monitor from 2014 July to 2022 January through the Bayesian block algorithm. We find that the MVTs peak at ∼2 ms, corresponding to a light-travel time size of about 600 km, which supports the magnetospheric origin in pulsar-like models. The shock radius and the Lorentz factor of the jet are also constrained in GRB-like models. Interestingly, the MVT of the XRB associated with FRB 200428 is ∼70 ms, which is longer than that of most bursts and implies its special radiation mechanism. In addition, the median of MVTs is 7 ms, shorter than the median MVTs of 40 ms and 480 ms for short GRBs or long GRBs, respectively. However, the MVT is independent of duration, similar to GRBs. Finally, we investigate the energy dependence of MVT and suggest that there is a marginal evidence for a power-law relationship like GRBs, but the rate of variation is at least about an order of magnitude smaller. These features may provide an approach to identify bursts with a magnetar origin. |
| Document Type: | article |
| File Description: | electronic resource |
| Language: | English |
| ISSN: | 1538-4365 0067-0049 |
| Relation: | https://doaj.org/toc/0067-0049 |
| DOI: | 10.3847/1538-4365/ace77c |
| Access URL: | https://doaj.org/article/e860043c050448e4bca91a67fc480dcd |
| Accession Number: | edsdoj.860043c050448e4bca91a67fc480dcd |
| Database: | Directory of Open Access Journals |
| ISSN: | 15384365 00670049 |
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| DOI: | 10.3847/1538-4365/ace77c |
| Published in: | The Astrophysical Journal Supplement Series |
| Language: | English |