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ID:28493735
大小:14.62 MB
页数:66页
时间:2018-12-10
《伽玛射线暴早期余晖观测以及liso-ep,z-г0关系》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、THEEARLyAFTERGLOW0BSERV=f气T10NANDALiso—EpJz—r0CORRELATIONINGAMMA-RAYBURSTSABSTRACTTheprogressofgamma-rayburstsinSwiftandFermieraisreviewedandaseriesofworkbasedonobservationdataarecarefullypresented.Weselectasampleof34gamma-raybursts(GRBs)whoserovaluesarederivedwiththeonsetpeaksobservedinth
2、eafterglowlightcurves(exceptforGRB060218,whoser0isestimatedwithitsradiodata),andfoundcorrelationsamongr0,theisotropicpeakluminosity(Lis。),andthepeakenergy(Ep.z)inthecosmologicalrestframe.ThecaseGRB060218,althoughdeviatedtheLlis。一E’prelationoftypicalGRBsinthejetCO—movingframewith30,itstills
3、atisfiesthemultiplecorrelationinthejetCO—movingframe.WearguethattheLiso—Ep,z—rocorrelationmaybemorephysicalthantheLiso—Ep,zcorrelationandexplorethepossibleoriginsofthiscorrelationanddiscussitsphysicalimplicationsforunderstandingGRBjetcompositionandradiationmechanism.Wealsointendtorevealthe
4、evolutionofcentralengineoverlongperiodbyinvestigatingther0variationofGRB090618andGRB140508.Wefoundthatther0offirstpulseis-91andthevaluesofthefollowingthreepulsesmaintainaround-215,indicatingthefireballisstillacceleratingduringthephotosphereemission.Weinvestigatethepropertiesofthepromptgamm
5、a—raysandtheambientmediumusingopticalobservationsofGRB111228Afrom95sectoabout50hoursafterthebulIsttriggerandthedataobservedwithSwiftandFermimissions.OurjointopticalandX—rayspectraljcitstotheafterglowdatashowthatthe11万方数据ambientmediumfeaturesaslowdust-to—gasratio.Incorporatingtheenergyinjec
6、tioneffect,ourbestfittotheafterglowlightcurveswiththestandardafterglowmodelviatheMarkovChinMonteCarlo(MCMC)techniqueprefersalowmediumdensity,whichimpliesthattheafterglowjetmaybeinahaloorinahotISM.ItisfoundthatGRB111228AsatisfiestheLiso—Ep,z—rorelation.KEYWORDS:gamma—rayburst;relativisticje
7、t;Lorentzfactor;isotropicluminosity;peakenergy儿l万方数据目录摘要iABSTRACT.ii第一章伽玛射线暴观测进展..11.1Swift卫星时代伽玛射线暴的观测进展..11.2Fermi卫星时代伽玛射线暴观测进展.6第二章伽玛射线暴理论模型简介112.1火球模型及其限制..112.1.1光球模型122.1.2内激波模型122.1.3外激波模型142.2磁化喷流模型.16第三章Lis0一Ep-z—r0关系及其对喷流辐射物理的限制203.1简介.203.1.1各项同性光度/
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