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题名: MODELING THE MULTI-BAND AFTERGLOW OF GRB 091127: EVIDENCE OF A HARD ELECTRON ENERGY SPECTRUM WITH AN INJECTION BREAK
作者: Zhang, Q;  Huang, YF;  Zong, HS
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2015
卷号: 811, 期号:2, 页码:83
关键词: acceleration of particles ;  gamma-ray burst: individual (GRB 091127) ;  ISM: jets and outflows
学科分类: Astronomy & Astrophysics
DOI: http://dx.doi.org/10.1088/0004-637X/811/2/83
通讯作者: Zhang, Q (reprint author), Nanjing Univ, Dept Phys, Nanjing 210093, Jiangsu, Peoples R China.
文章类型: Article
英文摘要: The afterglows of gamma-ray bursts (GRBs) are believed to originate from the synchrotron emission of shock-accelerated electrons produced by the interaction between the outflow and the external medium. The accelerated electrons are usually assumed to follow a power-law energy distribution with an index of p. Observationally, although most GRB afterglows have a p larger than 2, there are still a few GRBs suggestive of a hard (p < 2) electron spectrum. The well-sampled broad-band afterglow data for GRB 091127 show evidence of a hard electron spectrum and strong spectral evolution, with a spectral break moving from high to lower energies. The spectral break evolves very fast and cannot be explained by the cooling break in the standard afterglow model, unless evolving microphysical parameters are assumed. In addition, the multi-band afterglow light curves show an achromatic break at around 33 ks. Based on the model of a hard electron spectrum with an injection break, we interpret the observed spectral break as the synchrotron frequency corresponding to the injection break, and the achromatic break as a jet break caused by the jet-edge effect. It is shown that the spectral evolution and the multi-band afterglow light curves of GRB 091127 can be well reproduced by this model.
类目[WOS]: Astronomy & Astrophysics
关键词[WOS]: GAMMA-RAY BURST ;  RELATIVISTIC COLLISIONLESS SHOCKS ;  LIGHT CURVES ;  PARTICLE-ACCELERATION ;  BROAD-BAND ;  ULTRARELATIVISTIC SHOCKS ;  THEORETICAL IMPLICATIONS ;  PHYSICAL PARAMETERS ;  OPTICAL AFTERGLOW ;  MAGNETIC-FIELDS
收录类别: SCI
项目资助者: National Basic Research Program of China [2014CB845800] ;  National Natural Science Foundation of China [11473012, 11475085, 11275097]
语种: 英语
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内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/20846
Appears in Collections:理论物理所2015年知识产出_期刊论文

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Recommended Citation:
Zhang, Q,Huang, YF,Zong, HS. MODELING THE MULTI-BAND AFTERGLOW OF GRB 091127: EVIDENCE OF A HARD ELECTRON ENERGY SPECTRUM WITH AN INJECTION BREAK[J]. ASTROPHYSICAL JOURNAL,2015,811(2):83.
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文件名: MODELING THE MULTI-BAND AFTERGLOW OF GRB 091127- EVIDENCE OF A HARD ELECTRON ENERGY SPECTRUM WITH AN INJECTION BREAK.pdf
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