超新星遗迹和恒星冕中高温热气体的X射线辐射观测研究.ppt

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1、OnDeuteratedPolycyclicAromaticHydrocarbonsinSpace杨雪娟(XTU)Collabrators：李爱根(MU),R.Glaser(MU)星际物理与化学（昆明2018）OriginofDeuteriumEpstein+,1976,NatureSpallation;PregalacticCosmicRays;ShockWaves;Hotexplosions;DisruptedNSs；×BigBangNucleosynthesis(BBN)√ofCosmologicalInt

2、erests(D/H)primCosmologicalparameters&Baryon–photonratiobaryonicdensityoftheUniverse.TheamountofdeuteriuminagalaxyCosmicnucleosynthesis&chemicalevolutionofthegalaxy；ComparingtheprimordialandGalacticdeuteriumabundancesDiscriminatingamongdifferentGalacticch

3、emicalevolutionmodels；PrimordialDabundanceMeasureusinggascloudsthatareseeninabsorptionagainstthelightofanunrelatedbackgroundlightsource(typically,aquasar)(Adams1976).(D/H)prim~25-28ppm(Cookeetal.2018;Zavariginetal.2018)MeasurefromtheanalysisofCMBobservationda

4、ta.(D/H)prim~27ppm(Cyburtetal.2003;Cocetal.2004;Dunkleyetal.2009)DeuteriumintheLocalISMvandervoort+,2017~83−92%oftheprimordialdeuteriumatthesolarcircle.Veryclosetotheprimordialvalueatlowmetallicity.Decreasestowardshighermetallicity,withverysmallscatterbetween

5、D&Oabundance.DeuteriumintheLocalISMTheD/HratiomeasuredfromCopernicus,HST,IMAPS&FUSEshowslargevariationsfromsightlinetosightlinethroughthelocalISM(Linskyetal.2006;2009).Linsky2009DReduction:AstrationAstration：ConversionofDintootherelementsbynuclearfusioninstar

6、s;Problems:Regionsseparatedbyonlyafewhundredpchaveextremelydifferentstarformationhistories;Nootherevidenceofsuchvariationsinstarformationactivity.Turbulentdiffusionhasnothomogenizedtheelementalabundancesinthegas;Turbulentmixingisexpectedtobeeffectiveatmixin

7、ggasoverlengthscalesofhundredsofpcon109yrtimescales.ProblemwithAstrationDraine2006TheexpectedassociatedvariationsofO/Hisnotobserved.NoanticorrelationofO-Dabundance:Notastration;Otherprocess!DepletionofD:RoleofDustDraine2006Carbonaceousgrains&PAHsareapossibler

8、eposi-toryofmissingD:CarbonaceousinterstellargrainscouldincorporateenoughdeuteriumatomstosubstantiallyreducetheDabundanceinthegasphase.Variationsof(D/H)gasVariationsofDsequesteredindustg