Suzaku Observation of Diffuse X-Ray Emission from the Carina Nebula

[摘要] WestudiedextendedX-rayemissionfromtheCarinaNebulatakenwiththeSuzakuCCDcameraXISon2005August29.TheX-raymorphology,plasmatemperature,andabsorptiontotheplasmaareconsistentwiththeearlierEinsteinresults.TheSuzakuspectranewlyrevealedemissionlinesfromvariousspecies,includingoxygen,butnotfromnitrogen.Thisresultrestrictsthe$$mathrm{N/O}$$ratiotobesignificantlylow,comparedwithevolvedmassivestellarwinds,suggestingthatthediffuseemissionoriginatedinanoldsupernovaremnantorasupershellproducedbymultiplesupernovaremnants.TheX-rayspectrafromthenorthandsouthof$$eta$$Carshoweddistinctdifferencesbetween0.3–2 keV.ThesouthspectrumshowsstrongL-shelllinesofironionsandK-shelllinesofsiliconions,whilethenorthspectrumshowsthemweakinintensity.Thismeansthatthesiliconandironabundancesareafactorof2–4higherinthesouthregionthaninthenorthregion.TheabundancevariationmaybeproducedbyanSNRejecta,orrelatedtodustformationaroundthestar-formingcore.

[学科分类] 天文学(综合)

[关键词] "ISM: abundances";"ISM: individual objects (Carina Nebula)";"ISM: supernova remnants";"X-rays: ISM"