Prompt optical emission from gamma-ray bursts with multiple timescale variability of central engine activities

CORC > 云南天文台 > 中国科学院云南天文台 > 中国科学院天体结构与演化重点实验室

	Prompt optical emission from gamma-ray bursts with multiple timescale variability of central engine activities
	Xu, Si-Yao 1; Li, Zhuo 1,2
刊名	ESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2014-04
卷号	14 期号:4 页码:411-422
关键词	gamma rays: bursts GRB 080319B
ISSN号	1674-4527
通讯作者	Xu, SY (reprint author), Peking Univ, Dept Astron, Beijing 100871, Peoples R China.
英文摘要	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.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	RESIDUAL COLLISIONS ; FERMI OBSERVATIONS ; GRB 080916C ; MODEL ; RADIATION ; AFTERGLOWS ; MECHANISM ; OUTFLOWS ; SPECTRA ; SHOCKS
收录类别	SCI
原文出处	http://iopscience.iop.org/article/10.1088/1674-4527/14/4/004/meta
语种	英语
WOS记录号	WOS:000333689000004
公开日期	2016-06-01
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/9448]
专题	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.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
推荐引用方式 GB/T 7714	Xu, Si-Yao,Li, Zhuo. 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.(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.