Roles of SN IA and SN II in ICM Enrichment

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Title:		Roles of SN IA and SN II in ICM Enrichment
Authors:		Ishimaru, Yuhri; Arimoto, Nobuo
Affiliation:		AA(Department of Astronomy, School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113; (YI):), AB(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, U.K.})
Publication:		Publ. of the Astronomical Society of Japan, v.49, p.1-8. (PASJ Homepage)
Publication Date:		02/1997
Origin:		PASJ
PASJ Keywords:		GALAXIES: ELLIPTICAL, GALAXIES: EVOLUTION, GALAXIES: INTERGALACTIC MEDIUM, GALAXIES: X-RAYS, SUPERNOVAE
Bibliographic Code:		1997PASJ...49....1I

Abstract

Based on ASCA observations Mushotzky et al. (1996, ApJ 466, 686) have recently derived the relative abundance ratios of alpha -elements to iron, [alpha /Fe] =~ 0.2--0.3, for four rich clusters, and have suggested that the origin of metals in an intra-cluster medium (ICM) is not a type-Ia supernovae (SNIa), but a type-II supernovae (SNII). However, these authors used the solar photospheric iron abundance for ASCA data reduction, while the meteoritic iron abundance is usually adopted in chemical-evolution studies. It is true that although the photospheric and meteoritic solar abundances are consistent for most of the elements, a serious discrepancy is known to exist for iron; indeed, the photospheric abundance of iron is N_Fe/N_H = 4.68* 10(-5) by number, while the meteoritic value is 3.24* 10(-5) . The argument concerning the relative roles of SNIa and SNII in ICM enrichment is quite sensitive to the precise values of [alpha /Fe], and one should use an identical solar iron abundance in data reduction as well as in theoretical arguments. We therefore adopt the meteoritic iron abundance, which is consistent with chemical-evolution studies, and shift Mushotzky et al.'s ASCA data by Delta [alpha /Fe] =~ - -0.16 dex. By comparing the corrected [alpha /Fe] values with theoretical nucleosynthesis prescriptions of SNIa and SNII, we reach a conclusion that an SNIa iron contribution of 50% or higher in the ICM enrichment could not be ruled out, and might indeed be favored based on the ASCA spectra.

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