Roles of SN Ia and SN II in ICM Enrichment

Publications of the Astronomical Society of Japan

Ishimaru, Yuhri²  Arimoto, Nobuo¹ 

[1] Institute of Astronomy, Facult of Science, The University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181; Institut für Theoretische Astrophysik, Universität Heidelberg, Tiergartenstrasse 15, D-69121 Heidelberg, Germany and Department of Physics, University of Durham, South Road, Durham, DH1 3LE, UK;Department of Astronomy, School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113 E-mail(YI):

关键词: "Galaxies: elliptical";    "galaxies: evolution";    "intergalactic medium";    "Galaxies: X-rays";    Supernovae;   

DOI  :  10.1093/pasj/49.1.1

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

BasedonASCAobservationsMushotzkyetal.(1996,ApJ466,686)haverecentlyderivedtherelativeabundanceratiosofα-elementstoiron,[α/Fe]≃0.2–0.3,forfourrichclusters,andhavesuggestedthattheoriginofmetalsinanintra-clustermedium(ICM)isnotatype-Iasupernovae(SNIa),butatype-IIsupernovae(SNII).However,theseauthorsusedthesolarphotosphericironabundanceforASCAdatareduction,whilethemeteoriticironabundanceisusuallyadoptedinchemical-evolutionstudies.Itistruethatalthoughthephotosphericandmeteoriticsolarabundancesareconsistentformostoftheelements,aseriousdiscrepancyisknowntoexistforiron;indeed,thephotosphericabundanceofironisNFe/NH=4.68·10−5bynumber,whilethemeteoriticvalueis3.24·10−5.TheargumentconcerningtherelativerolesofSNIaandSNIIinICMenrichmentisquitesensitivetotheprecisevaluesof[α/Fe],andoneshoulduseanidenticalsolarironabundanceindatareductionaswellasintheoreticalarguments.Wethereforeadoptthemeteoriticironabundance,whichisconsistentwithchemical-evolutionstudies,andshiftMushotzkyetal.'sASCAdatabyΔ[α/Fe]≃−0.16dex.Bycomparingthecorrected[α/Fe]valueswiththeoreticalnucleosynthesisprescriptionsofSNIaandSNII,wereachaconclusionthatanSNIaironcontributionof50%orhigherintheICMenrichmentcouldnotberuledout,andmightindeedbefavoredbasedontheASCAspectra.

【 授权许可】

Unknown