Study of the relationship between the gamma ray bursts and their host galaxies

Gamma ray bursts (GRBs) belong to the most energetic events in the Universe. Recently, the extragalactic nature of these sources has been confirmed with the discovery of several host galaxies (HGs) and the measurement of their redshifts. To explain the ori

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aAsociaci´onArgentinadeAstronom´ aBAAA,Vol.48,2005E.M.Arnal,A.Brunini,J.J.Clari´a,J.C.Forte,D.A.G´omez,D.Garc´ aLambas,Z.L´opezGarc´ a,StellaM.Malaroda,&G.E.Romero,http://www.mianfeiwendang.comUNICACION´DETRABAJO–CONTRIBUTEDPAPERStudyandtheirofthehostrelationshipgalaxiesbetweenthegammarayburstsSebasti´anE.NuzaInstitutodeAstronom´ ayF´ sicadelEspacio,BuenosAires,Argentina;sebasn@iafe.uba.arPatriciaB.TisseraInstitutodeAstronom´ ayF´ sicadelEspacio,BuenosAires,Argentina;patricia@iafe.uba.arLeonardoJ.PellizzaServiced’Astrophysique,DSM/DAPNIA,CEA,Saclay,France;leonardo.pellizza@http://www.mianfeiwendang.commbasIATE,ObservatorioAstron´omicodeC´ordoba,C´ordoba,Argentina;dgl@oac.uncor.eduCeciliaScannapiecoInstitutodeAstronom´ ayF´ sicadelEspacio,BuenosAires,Argentina;cecilia@iafe.uba.arMar´ aE.DeRossiInstitutodeAstronom´ ayF´ sicadelEspacio,BuenosAires,Argentina;derossi@iafe.uba.ar

Abstract.Gammaraybursts(GRBs)belongtothemostenergeticeventsintheUniverse.Recently,theextragalacticnatureofthesesourceshasbeencon rmedwiththediscoveryofseveralhostgalaxies(HGs)andthemeasurementoftheirredshifts.ToexplaintheoriginofGRBsvariousmodelshavebeenproposed,amongwhichthecoalescenceofcompactobjectsandthecollapsarscenariosarethemostrepresentative,beingthecollapsarmodeloneofthemostacceptedtoexplainthelongdurationGRBs.AnaturalconsequenceofthismodelisthattheGRBswouldtracethestarformationrate(SFR)oftheirHGs.InthiscontributedpaperwepresentpreliminaryresultsofthedevelopmentofaMontecarlo-basedcodeforcollapsareventformationwhichiscoupledtochemical-

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