Evaluating the Bulk Lorentz Factors of Outflow Material: Lessons Learned from the Extremely Energetic Outburst GRB 160625B | |
Wang, Yuan-Zhu1,2; Wang, Hao1,2; Zhang, Shuai1,2; Liang, Yun-Feng1,2; Jin, Zhi-Ping1; He, Hao-Ning1; Liao, Neng-Hui1; Fan, Yi-Zhong1; Wei, Da-Ming1 | |
刊名 | ASTROPHYSICAL JOURNAL |
2017-02-10 | |
卷号 | 836期号:1页码:8 |
关键词 | gamma-ray burst: individual (GRB 160625B) methods: data analysis radiation mechanisms: thermal |
ISSN号 | 0004-637X |
DOI | 10.3847/1538-4357/aa56c6 |
英文摘要 | GRB 160625B is an extremely bright outburst with well-monitored afterglow emission. The geometry-corrected energy is high, up to similar to 5.2 x 10(52) erg or even similar to 8 x 10(52) erg, rendering it the most energetic GRB prompt emission recorded so far. We analyzed the time-resolved spectra of the prompt emission and found that in some intervals there were likely thermal-radiation components and the high energy emission was characterized by significant cutoff. The bulk Lorentz factors of the outflow material are estimated accordingly. We found out that the Lorentz factors derived in the thermal- radiation model are consistent with the luminosity-Lorentz factor correlation found in other bursts, as well as in GRB 090902B for the time-esolved thermal-radiation components, while the spectral cutoff model yields much lower Lorentz factors that are in tension with the constraints set by the electron pair Compton scattering process. We then suggest that these spectral cutoffs are more likely related to the particle acceleration process and that one should be careful in estimating the Lorentz factors if the spectrum cuts at a rather low energy (e.g., similar to tens of MeV). The nature of the central engine has also been discussed, and a stellarmass black hole is favored. |
WOS关键词 | GAMMA-RAY BURSTS ; EARLY OPTICAL AFTERGLOWS ; THERMAL EMISSION ; REVERSE SHOCK ; MODEL ; GRB-990123 ; FIREBALLS ; FLASH ; CONSTRAINTS ; PARAMETERS |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | IOP PUBLISHING LTD |
WOS记录号 | WOS:000397304500033 |
内容类型 | 期刊论文 |
源URL | [http://libir.pmo.ac.cn/handle/332002/23189] |
专题 | 中国科学院紫金山天文台 |
通讯作者 | Liang, Yun-Feng |
作者单位 | 1.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Peoples R China 2.Univ Chinese Acad Sci, Yuquan Rd 19, Beijing 100049, Peoples R China |
推荐引用方式 GB/T 7714 | Wang, Yuan-Zhu,Wang, Hao,Zhang, Shuai,et al. Evaluating the Bulk Lorentz Factors of Outflow Material: Lessons Learned from the Extremely Energetic Outburst GRB 160625B[J]. ASTROPHYSICAL JOURNAL,2017,836(1):8. |
APA | Wang, Yuan-Zhu.,Wang, Hao.,Zhang, Shuai.,Liang, Yun-Feng.,Jin, Zhi-Ping.,...&Wei, Da-Ming.(2017).Evaluating the Bulk Lorentz Factors of Outflow Material: Lessons Learned from the Extremely Energetic Outburst GRB 160625B.ASTROPHYSICAL JOURNAL,836(1),8. |
MLA | Wang, Yuan-Zhu,et al."Evaluating the Bulk Lorentz Factors of Outflow Material: Lessons Learned from the Extremely Energetic Outburst GRB 160625B".ASTROPHYSICAL JOURNAL 836.1(2017):8. |
个性服务 |
查看访问统计 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论