X-Ray Spectrum of Sagittarius A East

[摘要] SgrAEastisayoungSNRlocatedintheGalacticCenter(GC)region.SincetheGCregionisoccupiedbydiffuseX-rayemission(GCDX)withastrong6.7 keVline,anestimationoftheGCDXiscrucialtostudytheX-rayspectrumofSgrAEast.ThefluxandspectrumoftheGCDXarefoundtobesmoothlydistributedaroundandacrossSgrAEast,andhenceareliableGCDXsubtractioncanbemade.ThispaperpresentstheX-rayspectrumofSgrAEastwiththeXISonboardSuzaku.Inadditiontothepreviouslyreported$$mathrm{K}alpha$$linesfromSXV,ArXVII,CaXIX,andFeXXV(allHe-likeatoms),wefound$$mathrm{K}alpha$$linesfromSXVI,ArXVIII,FeXXVI(allhydrogenicatoms),andNiXXVII(He-like),$$mathrm{K}eta$$linesfromSXV,ArXVII,andFeXXV,anda$$mathrm{K}gamma$$linefromFeXXV.Plasmadiagnosticsusingtheselinesrevealedthepresenceofatleastatwo-temperatureplasma.Theoverallspectrumcanbefittedwithatwo-temperature($$sim1.2,mathrm{keV}$$and$$sim6,mathrm{keV}$$)plasmainionizationequilibriumplusapower-lawcomponent.

[学科分类] 天文学(综合)

[关键词] "Galaxy: center";"ISM: abundances";"ISM: supernova remnants"