摘要
了解伽马射线暴(简称伽马暴)的喷流结构对更进一步理解伽马暴的前身星系统和中心引擎是非常重要的.利用蒙特卡洛模拟的方法,研究了均匀分布、高斯分布以及幂律分布三种伽马暴喷流结构模型对其各向同性能量及红移分布的影响,并与观测数据进行了比较分析发现,伽马暴的喷流总能量均值在49.79<logE_(c)<52.71区间,可能要比直接通过观测推导出的各向同性能量少2个数量级以上.从三个模型得出的伽马暴各向同性能量E_(iso)分布中,只有θ_(j)=30°的均匀分布模型与观测符合得较好(K-S检验P=0.072 4).然而对于红移分布,所有模型的结果都比较相似,并且与观测符合得不是很好(K-S检验P<0.05).总之,文章的结果表明,目前的观测数据可能还不足以区分三种喷流模型.
Understanding the jet structure of Gamma-ray burst(GRB)is a vital step to unveil the real mechanism of its’center engine and progenitor star.By using monte carlo simulation method,we study the influences of different jet structure models(Uniform,Gaussian and Power-law)on isotropic equivalent energy and redshift distributions,respectively.After comparing and analysing the results with observation,we find that the mean value of the jet total energy are in the range of 49.79<logE_(c)<52.71,which may be more than two orders magnitude less than the isotropic energy derived directly from observation.According to the results of E_(iso)distribution of three models,only theθ_(j)=30°Uniform model consists relatively well with the observation.However,as for the redshift distribution,the results of all models are quite similar,and consist with observation not very well.Generally speaking,our result shows that it is not sufficient enough for current GRB sample to distinguish these three models.
作者
栾天成
郝景萌
LUAN Tian-cheng;HAO Jing-meng(Center for Astrophysics,Guangzhou University,Guangzhou 510006,China)
出处
《广州大学学报（自然科学版）》
CAS
2020年第6期70-76,共7页
Journal of Guangzhou University:Natural Science Edition
基金
国家自然科学基金资助项目(11503004)。
关键词
伽马暴
喷流张角
蒙特卡洛模拟
Gamma-ray burst
jet opening angle
Monte carlo
作者简介
栾天成(1994-),男,硕士研究生.E-mail:dingdingluan@e.gzhu.edu.cn;通信作者:郝景萌,E-mail:jmhao@gzhu.edu.cn。
