Magnetic energy injection in GRB 080913  

作　　者：LIU XueWen,WU XueFeng & LU Tan Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210008,China 

出　　处：《Science China(Physics,Mechanics & Astronomy)》2010年第S1期262-264,共3页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Basic Research Program of China (Grant No. 2009CB824800);the National Natural Science Foundation of China (Grant Nos. 10473023, 10503012, 10621303, and 10633040);the Special Foundation for the Authors of National Excellent Doctoral Dissertations of China by Chinese Academy of Sciences,and the NASA Grant (Grant No. NNX08AL40G)

摘　　要：GRB 080913,with a spectroscopically determined redshift of z=6.7,was the record holder for being the most remote stellar object before the discovery of the recent gamma-ray burst GRB 090423,whose redshift is about 8.2.The gradually accumulated high redshift GRB sample has shed light on the origin and physical properties of GRBs during the cosmic re-ionization epoch.Here,we present a detailed numerical fit to the multi-wavelength data of the optical afterglow of GRB 080913 and then constrain its circumburst environment and the other model parameters.We conclude that the late optical/X-ray plateau at about one day since the burst is due to the Poynting-flux dominated injection from the central engine which is very likely a massive spinning black hole with super strong magnetic fields.GRB 080913,with a spectroscopically determined redshift of z=6.7,was the record holder for being the most remote stellar object before the discovery of the recent gamma-ray burst GRB 090423,whose redshift is about 8.2.The gradually accumulated high redshift GRB sample has shed light on the origin and physical properties of GRBs during the cosmic re-ionization epoch.Here,we present a detailed numerical fit to the multi-wavelength data of the optical afterglow of GRB 080913 and then constrain its circumburst environment and the other model parameters.We conclude that the late optical/X-ray plateau at about one day since the burst is due to the Poynting-flux dominated injection from the central engine which is very likely a massive spinning black hole with super strong magnetic fields.

关 键 词：gamma-rays:bursts OUTFLOW BLACK HOLE 

分 类 号：P172.3[天文地球—天文学]