Discovery of a New Supernova Remnant in the Direction of G69.7+1.0

[摘要] Wediscoveredamiddle-agedsupernovaremnant(SNR)inthevicinityofG69.7+1.0usingtheASCAsatellite.G69.7+1.0wasidentifiedinthe2.7GHzsurveyandclassifiedasashell-typeSNRwithadiameterof16′.DuringtheROSATall-skysurvey,theX-rayemissionwasdetectedinthedirectionofG69.7+1.0.However,itextendsbeyondtheradioshell,andanX-raybrightregionwaslocatedoutsideoftheradioshell.AspectralstudywiththeASCAandROSATshowsathinthermalplasmawithanelectrontemperatureof∼0.4keV.Thereisnosignificantvariationofthespectralparametersoverthefieldofview,exceptforthelowercolumndensityoftheeasternpart.WealsofoundalargeshellstructurewhichsurroundstheX-raybrightregioninbothopticalandradioimages.WesuggestthattheobservedX-rayemissionisassociatedwiththelargeopticalandradioshell,andthattheyarepartofanewSNR,differentfromtheradioSNRG69.7+1.0,whichwehavenamedAXJ2001+3235orG69.4+1.2.Thelargeshellandtheelectrontemperatureof∼0.4keVindicatethatAXJ2001+3235isanevolvedSNR.FromacomparisonwiththecolumndensityofCTB80(G69.0+2.7),weestimatethatthedistanceoftheSNRisabout2.5kpc.

[学科分类] 天文学(综合)

[关键词] "ISM: individual objects (G697+10;G694+12)";"ISM: supernova remnants";"X-rays: ISM"