“Double-tracking” Characteristics of the Spectral Evolution of GRB 131231A: Synchrotron Origin?
文献类型：期刊论文
| 作者 | Li,Liang1,2; Geng,Jin-Jun3,4; Meng,Yan-Zhi1,5; Wu,Xue-Feng1; Huang,Yong-Feng3,4; Wang,Yu2,6,7; Moradi,Rahim2,6; Uhm,Z. Lucas8,9; Zhang,Bing10 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2019-10-16 |
| 卷号 | 884期号:2 |
| ISSN号 | 0004-637X |
| 关键词 | gamma-ray burst: general radiation mechanisms: non-thermal |
| DOI | 10.3847/1538-4357/ab40b9 |
| 英文摘要 | Abstract The characteristics of the spectral evolution of the prompt emission of gamma-ray bursts (GRBs), which are closely related to the radiation mechanism (synchrotron or photosphere), are still an unsolved subject. Here, by performing the detailed time-resolved spectral fitting of GRB 131231A, which has a very bright and well-defined single pulse, some interesting spectral evolution features have been found. (i) Both the low-energy spectral index α and the peak energy Ep exhibit the “flux-tracking” pattern (“double-tracking” characteristics). (ii) The parameter relations, i.e., F (the energy flux)-α, F–Ep, and Ep–α, along with the analogous Yonetoku Ep–Lγ,iso relation for the different time-resolved spectra, show strong monotonous (positive) correlations, both in the rising and the decaying phases. (iii) The values of α do not exceed the synchrotron limit (α?=??2/3) in all slices across the pulse, favoring the synchrotron origin. We argue that the one-zone synchrotron emission model with the emitter streaming away at a large distance from the central engine can explain all of these special spectral evolution characteristics. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-884-2-AB40B9 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/28319]  |
| 专题 | 中国科学院紫金山天文台 |
| 作者单位 | 1.Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210034, People’s Republic of China; liang.li@icranet.org, xfwu@pmo.ac.cn 2.ICRANet, Piazza della Repubblica 10, I-65122 Pescara, Italy 3.School of Astronomy and Space Science, Nanjing University, Nanjing 210023, People’s Republic of China; gengjinjun@nju.edu.cn 4.Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing 210023, People’s Republic of China 5.University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China 6.Dip. di Fisica and ICRA, Sapienza Universit di Roma, Piazzale Aldo Moro 5, I-00185 Rome, Italy 7.INAF – Osservatorio Astronomico d’Abruzzo, Via M. Maggini snc, I-64100, Teramo, Italy; yu.wang@inaf.it 8.Astrophysics Science Division, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA; z.lucas.uhm@gmail.com 9.Korea Astronomy and Space Science Institute, Daejeon 34055, Republic of Korea 10.Department of Physics and Astronomy, University of Nevada, Las Vegas, NV 89154, USA |
| 推荐引用方式 GB/T 7714 | Li,Liang,Geng,Jin-Jun,Meng,Yan-Zhi,et al. “Double-tracking” Characteristics of the Spectral Evolution of GRB 131231A: Synchrotron Origin?[J]. The Astrophysical Journal,2019,884(2). |
| APA | Li,Liang.,Geng,Jin-Jun.,Meng,Yan-Zhi.,Wu,Xue-Feng.,Huang,Yong-Feng.,...&Zhang,Bing.(2019).“Double-tracking” Characteristics of the Spectral Evolution of GRB 131231A: Synchrotron Origin?.The Astrophysical Journal,884(2). |
| MLA | Li,Liang,et al."“Double-tracking” Characteristics of the Spectral Evolution of GRB 131231A: Synchrotron Origin?".The Astrophysical Journal 884.2(2019). |
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来源：紫金山天文台
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