Spectral energy distributions of submmradio bright gamma-ray burst host galaxies

We present optical to radio spectral energy distribution fitting of the host galaxies of four long gamma-ray bursts: 980703, 000210, 000418 and 010222, which were detected at submillimetre and/or radio wavelengths. We find that only very young starburst ga

Spectralenergydistributionsofsubmm/radiobrightgamma-raybursthostgalaxies

Micha J.Micha owskiandJensHjorth

arXiv:0708.4014v1 [astro-ph] 29 Aug 2007DarkCosmologyCentre,NielsBohrInstitute,UniversityofCopenhagen,JulianeMariesVej30,DK-2100Copenhagen,DenmarkAbstract.Wepresentopticaltoradiospectralenergydistribution ttingofthehostgalaxiesoffourlonggamma-raybursts:980703,000210,000418and010222,whichweredetectedatsubmillimetreand/orradiowavelengths.We ndthatonlyveryyoungstarburstgalaxymodelsareconsistentwiththedatahavingbothblueopticalcolorsandapronouncedsubmmemission.Foreachhostweareabletoconstructamodelconsistentwiththeshort-andlong-wavelengthpartsofthespectra.We ndgalaxyagesrangingfrom0.09to2.0Gyrsandstarformationratesrangingfrom138to380M⊙yr 1.Keywords:galaxies:GRBhosts—galaxies:starburst—galaxies:highredshift—gammarays:bursts—individual:GRB980703,000210,000418,010222PACS:98.54.Ep;98.62.Ai;98.70.RzINTRODUCTIONObservationsofgamma-rayburst(GRB)hostgalaxieshaveattractedalotofinterestsincethe rstinterpretationofaconstantextendedsourceataGRBpositionasthehostgalaxy2].AdetaileddescriptionoftheGRBenvironmentcanprovideimportantconstraintsonGRBphysics[seeforareview]andcanbeusedforstatisticalstudiesofstarburstgalaxies.ThehostgalaxiesofthelongGRBs000210,000418and010222aresomewhatspecialbecausetheyaretheonlyhosts,among~30targetedbySCUBAshowingsubmil-limetreemission.ThehostsofGRBs980703and000418werealso rmlydetectedatra-diowavelengths[5,6,7]whereasthoseofGRBs000210and010222wereonlyweaklydetectedThehostofGRB010222wasalsodetectedatmillimetrewavelengthsBothsubmillimetreandradiodetectionsmayindicatehighstarformationrates(SFRs),oftheorderofseveralhundredssolarmassesperyear(M⊙yr 1),ifthewholeemissionispoweredbyastarburst,namelybydustatsubmillimetreandbysupernovaremnantsatradiowavelengths.Moreover,aspectralenergydistribution(SED)appliedonlytooptical/near-infrareddataagreedreasonablywithtemplates[9,ThispictureisconsistentwiththehypernovaGRBmodelHowever,thestarburstscenarioofGRBhostsismorecomplicatedbecause,unlikered,dusty,sturburstingsubmillimetregalaxies[14],GRBhostshavebeenfoundtoexhibitblueopticalcolorsThesubmillimetre/radio uxeswerealsounderestimatedbyanySEDtemplate ttedtotheopticaldata.

Mid-infraredSpitzerobservationsofthehostsofGRBs980703and010222couldnotbridgetheopticalandsubmillimetredataandprovideanexplanationoftheunusual

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