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High-energy component of GRB 941017 revisited and the reverse-shock synchrotron self-Compton emission
Wang, XY; Cheng, KS; Dai, ZG; Lu, T
2005-09-01
发表期刊ASTRONOMY & ASTROPHYSICS
卷号439期号:3页码:957-961
摘要The different temporal behaviors of the high energy component and the hundreds of keV emission from GRB 941017 suggest that they come from different emission regions. The nearly constant flux of this high energy component is consistent with being produced in the region of the early external shock formed when the ejecta hit the surrounding medium. Here we show that the relatively hard spectrum of this component can be numerically modelled as the synchrotron self-Compton emission from external reverse shock when the ejecta is decelerated by a typical interstellar medium. Constraints on the parameters of the fireball, such as the initial Lorentz factor., the burst energy, and the magnetic field equipartition fraction are obtained. Very high initial Lorentz factor (n greater than or similar to 10(3)) inferred for this burst may explain the rarity of this kind of high-energy component in gamma-ray bursts (GRBs). Large GeV - TeV flux from the reverse shock is predicted for GRBs with high initial Lorentz factors.
文章类型Article
关键词Gamma Rays : Bursts Radiation Mechanisms : Non-thermal
WOS标题词Science & Technology ; Physical Sciences
学科领域Astronomy & Astrophysics
DOI10.1051/0004-6361.20052984
关键词[WOS]GAMMA-RAY BURSTS ; EARLY AFTERGLOW EMISSION ; EARLY OPTICAL-EMISSION ; BACKGROUND-RADIATION ; SPECTRAL COMPONENT ; COSMIC-RAYS ; MODEL ; PREDICTIONS ; GRB-021211 ; PHOTONS
收录类别SCI
语种英语
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000231206900014
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文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/10953
专题院士文集_陆埮
作者单位1.Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China
2.Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China
3.Chinese Acad Sci, Purple Mtn Observ, Nanjing 210008, Peoples R China
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Wang, XY,Cheng, KS,Dai, ZG,et al. High-energy component of GRB 941017 revisited and the reverse-shock synchrotron self-Compton emission[J]. ASTRONOMY & ASTROPHYSICS,2005,439(3):957-961.
APA Wang, XY,Cheng, KS,Dai, ZG,&Lu, T.(2005).High-energy component of GRB 941017 revisited and the reverse-shock synchrotron self-Compton emission.ASTRONOMY & ASTROPHYSICS,439(3),957-961.
MLA Wang, XY,et al."High-energy component of GRB 941017 revisited and the reverse-shock synchrotron self-Compton emission".ASTRONOMY & ASTROPHYSICS 439.3(2005):957-961.
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