伽玛射线暴早期余晖观测以及liso-ep,z-г0关系

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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／