INVERSE COMPTON EMISSION FROM THE PROMPT OPTICAL EMISSION REGION IN GAMMA-RAY BURSTS

doi:10.1088/0004-637X/708/2/1357

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	INVERSE COMPTON EMISSION FROM THE PROMPT OPTICAL EMISSION REGION IN GAMMA-RAY BURSTS
	Zhao, XH 1; Dai, ZG 1; Liu, T 1; Bai JM(白金明)2,3 ; Peng, ZY 4; Zhao, XH (reprint author), Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China.
发表期刊	ASTROPHYSICAL JOURNAL
	2010-01-10
卷号	708 期号:2 页码:1357-1365
DOI	10.1088/0004-637X/708/2/1357
产权排序	第2完成单位
收录类别	SCI
关键词	Gamma Rays: Bursts Gamma Rays: Observations
摘要	Prompt optical emission accompanying gamma-ray emission has been detected in several gamma-ray bursts (GRBs), and its origin is still under debate. A plausible interpretation is that the prompt optical emission is generated by internal shocks but from regions different from the prompt gamma-ray one. Based on this model, we investigate in detail the inverse Compton (IC) emission including the synchrotron self-Compton (SSC) and second inverse Compton (2IC) ones from the optical emission region. We expect that this study could provide a clue to the origin of prompt optical emission. We first explore the dependence of IC Y factor on some uncertain parameters such as the magnetic field equipartition factor and the Lorentz factor of GRB ejecta. The results indicate that the 2IC emission associated with strong optical flashes (such as GRB 080319b) may be easily detected by Fermi for general parameters. If the SSC peak energy is in the range of tens-to-hundreds keV but generally much weaker than the prompt gamma-ray emission, the component may be detectable by Swift (BAT). For moderately bright optical flashes, the 2IC emission is marginally detectable while the SSC is not. For weak optical flashes, both the 2IC and SSC components are undetectable. We then carry out a numerical calculation of the expected spectrum including synchrotron, SSC, and the 2IC emission for various parameters, which verifies the analytical results. Finally, taking GRB 080319b as an example, we make a simple case study. We find that the detection of the 2IC emission optical region by Fermi is promising. The future simultaneous detection of optical and high energy (MeV-GeV) from the emissions will possibly reveal the nature of the prompt optical emission and allow us to measure the quantities presently unknown such as the bulk Lorentz factor, radiative electrons energy, and magnetic field.
项目资助者	National Natural Science Foundation of China [10873009, 10973034] ; National Basic Research Program of China (973 program) [2007CB815404, 2009CB824800] ; China Postdoctoral Science Foundation [20080441038] ; Natural Science Fund of Yunnan Province [2009ZC060M] ; Science Fund of the Education Department of Yunnan Province [08Y0129]
语种	英语
学科领域	Astronomy & Astrophysics
文章类型	Article
ISSN	0004-637X
URL	查看原文
WOS记录号	WOS:000273021000032
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	HIGH-ENERGY EMISSION ; INTERNAL SHOCKS ; X-RAY ; ELECTRON ACCELERATION ; PARTICLE-ACCELERATION ; COLLISIONLESS SHOCKS ; RELATIVISTIC WIND ; RADIATION-FIELDS ; SPECTRAL CATALOG ; EARLY AFTERGLOWS
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ynao.ac.cn/handle/114a53/5396
专题	南方基地中国科学院天体结构与演化重点实验室
通讯作者	Zhao, XH (reprint author), Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China.
作者单位	1.Department of Astronomy, Nanjing University, Nanjing 210093, China 2.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China 3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China 4.Department of Physics, Yunnan Normal University, Kunming 650092, China
推荐引用方式 GB/T 7714	Zhao, XH,Dai, ZG,Liu, T,et al. INVERSE COMPTON EMISSION FROM THE PROMPT OPTICAL EMISSION REGION IN GAMMA-RAY BURSTS[J]. ASTROPHYSICAL JOURNAL,2010,708(2):1357-1365.
APA	Zhao, XH,Dai, ZG,Liu, T,Bai JM,Peng, ZY,&Zhao, XH .(2010).INVERSE COMPTON EMISSION FROM THE PROMPT OPTICAL EMISSION REGION IN GAMMA-RAY BURSTS.ASTROPHYSICAL JOURNAL,708(2),1357-1365.
MLA	Zhao, XH,et al."INVERSE COMPTON EMISSION FROM THE PROMPT OPTICAL EMISSION REGION IN GAMMA-RAY BURSTS".ASTROPHYSICAL JOURNAL 708.2(2010):1357-1365.

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