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MODELING THE MULTI-BAND AFTERGLOW OF GRB 091127: EVIDENCE OF A HARD ELECTRON ENERGY SPECTRUM WITH AN INJECTION BREAK
Zhang, Qiang1,2; Huang, Yong-Feng3,4; Zong, Hong-Shi1,2,5
2015-10-01
发表期刊ASTROPHYSICAL JOURNAL
卷号811期号:2
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.
文章类型Article
关键词Acceleration Of Particles Gamma-ray Burst: Individual (Grb 091127) Ism: Jets And Outflows
WOS标题词Science & Technology ; Physical Sciences
DOI10.1088/0004-637X/811/2/83
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
语种英语
项目资助者National Basic Research Program of China(2014CB845800) ; National Natural Science Foundation of China(11473012 ; 11475085 ; 11275097)
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000363513800011
引用统计
文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/16040
专题毫米波和亚毫米波技术实验室
作者单位1.Nanjing Univ, Dept Phys, Nanjing 210093, Jiangsu, Peoples R China
2.Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210093, Jiangsu, Peoples R China
3.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China
4.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China
5.Chinese Acad Sci, State Key Lab Theoret Phys, Inst Theoret Phys, Beijing 100190, Peoples R China
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Zhang, Qiang,Huang, Yong-Feng,Zong, Hong-Shi. 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).
APA Zhang, Qiang,Huang, Yong-Feng,&Zong, Hong-Shi.(2015).MODELING THE MULTI-BAND AFTERGLOW OF GRB 091127: EVIDENCE OF A HARD ELECTRON ENERGY SPECTRUM WITH AN INJECTION BREAK.ASTROPHYSICAL JOURNAL,811(2).
MLA Zhang, Qiang,et al."MODELING THE MULTI-BAND AFTERGLOW OF GRB 091127: EVIDENCE OF A HARD ELECTRON ENERGY SPECTRUM WITH AN INJECTION BREAK".ASTROPHYSICAL JOURNAL 811.2(2015).
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