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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
Source PublicationASTROPHYSICAL JOURNAL
Volume811Issue:2
AbstractThe 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.
KeywordAcceleration Of Particles Gamma-ray Burst: Individual (Grb 091127) Ism: Jets And Outflows
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/811/2/83
WOS KeywordGAMMA-RAY BURST ; RELATIVISTIC COLLISIONLESS SHOCKS ; LIGHT CURVES ; PARTICLE-ACCELERATION ; BROAD-BAND ; ULTRARELATIVISTIC SHOCKS ; THEORETICAL IMPLICATIONS ; PHYSICAL PARAMETERS ; OPTICAL AFTERGLOW ; MAGNETIC-FIELDS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000363513800011
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/16032
Collection毫米波和亚毫米波技术实验室
Affiliation1.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
Recommended Citation
GB/T 7714
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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