A Comparative Study of Long and Short GRBs. II. A Multiwavelength Method to Distinguish Type II (Massive Star) and Type I (Compact Star) GRBs
文献类型：期刊论文
| 作者 | Li,Ye2,3,4,5; Zhang,Bing4; Yuan,Qiang1,5,6,7 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2020-07-01 |
| 卷号 | 897期号:2 |
| ISSN号 | 0004-637X |
| 关键词 | Gamma-ray bursts |
| DOI | 10.3847/1538-4357/ab96b8 |
| 英文摘要 | Abstract Gamma-ray bursts (GRBs) are empirically classified as long-duration GRBs (LGRBs, >2 s) and short-duration GRBs (SGRBs, <2 s). Physically they can be grouped into two distinct progenitor categories: those originating from collapse of massive stars (also known as Type II) and those related to mergers of compact stars (also known as Type I). Even though most LGRBs are Type II and most SGRBs are Type I, the duration criterion is not always reliable to determine the physical category of a certain GRB. Based on our previous comprehensive study of the multiwavelength properties of long and short GRBs, here we utilize the naive Bayes method to physically classify GRBs as Type I and Type II GRBs based on multiwavelength criteria. It results in a 0.5% training error rate and a 1% test error rate. Moreover, there is a gap [?1.2, ?0.16] in the distribution of the posterior odds, , the Type II to Type I probability ratio. Therefore, we propose to use as the parameter to classify GRBs into Type I (<0) or Type II (>0). The only confirmed Type I GRB, GRB 170817A, has log . According to this criterion, the supernova-less long GRBs 060614 and 060505 belong to Type I, and two controversial short GRBs 090426 and 060121 belong to Type II. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-897-2-AB96B8 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/63130]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, People's Republic of China yuanq@pmo.ac.cn 2.Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, People's Republic of China; liye_kiaa@pku.edu.cn 3.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People's Republic of China 4.Department of Physics and Astronomy, University of Nevada, Las Vegas, NV 89154, USA; zhang@physics.unlv.edu 5.Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, People’s Republic of China 6.School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026, Anhui, People's Republic of China 7.Center for High Energy Physics, Peking University, Beijing 100871, People's Republic of China |
| 推荐引用方式 GB/T 7714 | Li,Ye,Zhang,Bing,Yuan,Qiang. A Comparative Study of Long and Short GRBs. II. A Multiwavelength Method to Distinguish Type II (Massive Star) and Type I (Compact Star) GRBs[J]. The Astrophysical Journal,2020,897(2). |
| APA | Li,Ye,Zhang,Bing,&Yuan,Qiang.(2020).A Comparative Study of Long and Short GRBs. II. A Multiwavelength Method to Distinguish Type II (Massive Star) and Type I (Compact Star) GRBs.The Astrophysical Journal,897(2). |
| MLA | Li,Ye,et al."A Comparative Study of Long and Short GRBs. II. A Multiwavelength Method to Distinguish Type II (Massive Star) and Type I (Compact Star) GRBs".The Astrophysical Journal 897.2(2020). |
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来源：国家天文台
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