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Observation of spectral lines in the exceptional GRB 221009A

文献类型：期刊论文

作者Zhang, Yan-Qiu7,8; Xiong, Shao-Lin8; Mao JR(毛基荣)4,5,6; Zhang, Shuang-Nan8; Xue, Wang-Chen7,8; Zheng, Chao7,8; Liu, Jia-Cong7,8; Zhang, Zhen8; Wang, Xi-Lu8; Ge, Ming-Yu8
刊名SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
出版日期2024-08
卷号67期号:8
关键词GRB GRB 221009A emission line
ISSN号1674-7348
DOI10.1007/s11433-023-2381-0
产权排序第3完成单位
文献子类Article
英文摘要As the brightest gamma-ray burst ever observed, GRB 221009A provided a precious opportunity to explore spectral line features. In this article, we performed a comprehensive spectroscopy analysis of GRB 221009A jointly with GECAM-C and Fermi/GBM data to search for emission and absorption lines. For the first time we investigated the line feature throughout this GRB including the most bright part where many instruments suffered problems, and identified prominent emission lines in multiple time intervals. The central energy of the Gaussian emission line evolves from about 37 to 6 MeV, with a nearly constant ratio (about 10%) between the line width and central energy. Particularly, we find that both the central energy and the energy flux of the emission line evolve with time as a power law decay with power law index of -1 and -2, respectively. We suggest that the observed emission lines most likely origin from the blue-shifted electron positron pair annihilation 511 keV line. We find that a standard high latitude emission scenario cannot fully interpret the observation, thus we propose that the emission line comes from some dense clumps with electron positron pairs traveling together with the jet. In this scenario, we can use the emission line to directly, for the first time, measure the bulk Lorentz factor of the jet (Gamma) and reveal its time evolution (i.e., Gamma similar to t-1) during the prompt emission. Interestingly, we find that the flux of the annihilation line in the co-moving frame keeps constant. These discoveries of the spectral line features shed new and important lights on the physics of GRB and relativistic jet.
学科主题天文学 ; 星系与宇宙学
URL标识查看原文
出版地16 DONGHUANGCHENGGEN NORTH ST, BEIJING 100717, PEOPLES R CHINA
WOS关键词GAMMA-RAY BURST ; DISCOVERY ; AFTERGLOW ; SUPERNOVA ; EMISSION
资助项目National Key R&D Program of China[2021YFA0718500]; National Key R&D Program of China[2023YFE0101200]; Strategic Priority Research Program of Chinese Academy of Sciences[XDA15360102]; Strategic Priority Research Program of Chinese Academy of Sciences[XDA15360300]; Strategic Priority Research Program of Chinese Academy of Sciences[XDA15052700]; National Natural Science Foundation of China[12273042]; National Natural Science Foundation of China[61234003]; National Natural Science Foundation of China[61434004]; National Natural Science Foundation of China[61504141]; National Natural Science Foundation of China[11673062]; National Natural Science Foundation of China[12393813]; National Natural Science Foundation of China[2333007]; National Natural Science Foundation of China[12027803]; National Natural Science Foundation of China[12303045]; CAS Interdisciplinary Project[KJZD-EW-L11-04]; Strategic Priority Research Program on Space Science of the Chinese Academy of Sciences[XDA15360000]; Yunnan Revitalization Talent Support Program
WOS研究方向Physics
语种英语
WOS记录号WOS:001223671000001
出版者SCIENCE PRESS
资助机构National Key R&D Program of China[2021YFA0718500, 2023YFE0101200] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDA15360102, XDA15360300, XDA15052700] ; National Natural Science Foundation of China[12273042, 61234003, 61434004, 61504141, 11673062, 12393813, 2333007, 12027803, 12303045] ; CAS Interdisciplinary Project[KJZD-EW-L11-04] ; Strategic Priority Research Program on Space Science of the Chinese Academy of Sciences[XDA15360000] ; Yunnan Revitalization Talent Support Program
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/27213]  
专题星系类星体研究组
云南天文台_中国科学院天体结构与演化重点实验室
作者单位1.College of Electronic and Information Engineering, Tongji University, Shanghai, 201804, China
2.Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing, Guizhou Normal University, Guiyang, 550001, China;
3.College of Physics and Hebei Key Laboratory of Photophysics Research and Application, Hebei Normal University, Shijiazhuang, 050024, China;
4.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, 650216, China;
5.Center for Astronomical Mega-Science, Chinese Academy of Sciences, Beijing, 100012, China;
6.Yunnan Observatories, Chinese Academy of Sciences, Kunming, 650011, China;
7.University of Chinese Academy of Sciences, Beijing, 100049, China;
8.Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China;
推荐引用方式
GB/T 7714		 Zhang, Yan-Qiu,Xiong, Shao-Lin,Mao JR,et al. Observation of spectral lines in the exceptional GRB 221009A[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2024,67(8).
APA Zhang, Yan-Qiu.,Xiong, Shao-Lin.,毛基荣.,Zhang, Shuang-Nan.,Xue, Wang-Chen.,...&Zheng, Shi-Jie.(2024).Observation of spectral lines in the exceptional GRB 221009A.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,67(8).
MLA Zhang, Yan-Qiu,et al."Observation of spectral lines in the exceptional GRB 221009A".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 67.8(2024).

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来源：云南天文台

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