Prompt optical emission from gamma-ray bursts with multiple timescale variability of central engine activities
Xu, Si-Yao1; Li, Zhuo1,2; Xu, SY (reprint author), Peking Univ, Dept Astron, Beijing 100871, Peoples R China.
发表期刊ESEARCH IN ASTRONOMY AND ASTROPHYSICS
2014-04
卷号14期号:4页码:411-422
DOI10.1088/1674-4527/14/4/004
收录类别SCI
关键词Gamma Rays: Bursts Grb 080319b
摘要Complete high-resolution light curves of GRB 080319B observed by Swift present an opportunity for detailed temporal analysis of prompt optical emission. With a two-component distribution of initial Lorentz factors, we simulate the dynamical process of shells being ejected from the central engine in the framework of the internal shock model. The emitted radiations are decomposed into different frequency ranges for a temporal correlation analysis between the light curves in different energy bands. The resulting prompt optical and gamma-ray emissions show similar temporal profiles, with both showing a superposition of a component with slow variability and a component with fast variability, except that the gamma-ray light curve is much more variable than its optical counterpart. The variability in the simulated light curves and the strong correlation with a time lag between the optical and gamma-ray emissions are in good agreement with observations of GRB 080319B. Our simulations suggest that the variations seen in the light curves stem from the temporal structure of the shells injected from the central engine of gamma-ray bursts. Future observations with high temporal resolution of prompt optical emission from GRBs, e. g., by UFFO-Pathfinder and SVOM-GWAC, will provide a useful tool for investigating the central engine activity.
项目资助者National Natural Science Foundation of China(11273005) ; Specialized Research Fund for the Doctoral Program of Higher Education (SRFDP), China(20120001110064) ; CAS Open Research Program of Key Laboratory for the Structure and Evolution of Celestial Objects ; National Basic Research Program of China (973 Program)(2014CB845800)
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN1674-4527
URL查看原文
WOS记录号WOS:000333689000004
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]RESIDUAL COLLISIONS ; FERMI OBSERVATIONS ; GRB 080916C ; MODEL ; RADIATION ; AFTERGLOWS ; MECHANISM ; OUTFLOWS ; SPECTRA ; SHOCKS
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9448
专题中国科学院天体结构与演化重点实验室
通讯作者Xu, SY (reprint author), Peking Univ, Dept Astron, Beijing 100871, Peoples R China.
作者单位1.Department of Astronomy and Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
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Xu, Si-Yao,Li, Zhuo,Xu, SY . Prompt optical emission from gamma-ray bursts with multiple timescale variability of central engine activities[J]. ESEARCH IN ASTRONOMY AND ASTROPHYSICS,2014,14(4):411-422.
APA Xu, Si-Yao,Li, Zhuo,&Xu, SY .(2014).Prompt optical emission from gamma-ray bursts with multiple timescale variability of central engine activities.ESEARCH IN ASTRONOMY AND ASTROPHYSICS,14(4),411-422.
MLA Xu, Si-Yao,et al."Prompt optical emission from gamma-ray bursts with multiple timescale variability of central engine activities".ESEARCH IN ASTRONOMY AND ASTROPHYSICS 14.4(2014):411-422.
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