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4979<logE<c5271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分布中,只有θ=30°的均匀分布模型与观测符合得较好(K-S检验P=00724).然而对于红移分isoj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<005).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.
Abstract
UnderstandingthejetstructureofGamma-rayburst(GRB)isavitalsteptounveiltherealmecha-nismofitscenterengineandprogenitorstar.Byusingmontecarlosimulationmethod,westudytheinfluencesofdifferentjetstructuremodels(Uniform,GaussianandPower-law)onisotropicequivalentenergyandredshiftdistributions,respectively.Aftercomparingandanalysingtheresultswithobservation,wefindthatthemeanvalueofthejettotalenergyareintherangeof4979<logE<5271,whichmaybemorethantwoordersmag-cnitudelessthantheisotropicenergyderiveddirectlyfromobservation.AccordingtotheresultsofEdistribu-isotionofthreemodels,onlytheθ=30°Uniformmodelconsistsrelativelywellwiththeobservation.However,asjfortheredshiftdistribution,theresultsofallmodelsarequitesimilar,andconsistwithobservationnotverywell.Generallyspeaking,ourresultshowsthatitisnotsufficientenoughforcurrentGRBsampletodistinguishthesethreemodels.
关键词
伽马暴 /
喷流张角 /
蒙特卡洛模拟
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Key words
Gamma-rayburst /
jetopeningangle /
Montecarlo
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栾天成,郝景萌.
关于伽马射线暴喷流结构模型的研究. 广州大学学报(自然科学版). 2020, 19(6): 70-76
LUANTian-cheng,HAOJing-meng.
OntheGamma-rayburstjetstructuremodels. Journal of Guangzhou University(Natural Science Edition). 2020, 19(6): 70-76
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参考文献
[1] WoosleySE.Gammarayburstsfromstellarmassaccretiondisksaroundblackholes[J].TheAstrophysicalJournal,1993, 405:273277. [2] Paczyn'skiB.Aregammarayburstsinstarformingregions?[J].TheAstrophysicalJournal,1998,494:L45L48
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脚注
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