GRB jet beaming angle statistics  

作　　者：Yah Gao Zi-Gao Dai 

机构地区：[1]Department of Astronomy, Nanjing University, Nanjing 210093, China

出　　处：《Research in Astronomy and Astrophysics》2010年第2期142-150,共9页天文和天体物理学研究（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 10873009);the National Basic Research Program of China (973 program, No. 2007CB815404)

摘　　要：Existing theory and models suggest that a Type I （merger） GRB should have a larger jet beaming angle than a Type II （collapsar） GRB, but so far no statistical evidence is available to support this suggestion. In this paper, we obtain a sample of 37 beaming angles and calculate the probability that this is true. A correction is also devised to account for the scarcity of Type I GRBs in our sample. The probability is calculated to be 83% without the correction and 71% with it.Existing theory and models suggest that a Type I （merger） GRB should have a larger jet beaming angle than a Type II （collapsar） GRB, but so far no statistical evidence is available to support this suggestion. In this paper, we obtain a sample of 37 beaming angles and calculate the probability that this is true. A correction is also devised to account for the scarcity of Type I GRBs in our sample. The probability is calculated to be 83% without the correction and 71% with it.

关 键 词：gamma rays： bursts -- ISM： jets and outflows -- methods： statistical 

分 类 号：TB61[一般工业技术—制冷工程] P172.3[天文地球—天文学]