Roles of SNIa and SNII in ICM Enrichment

Yuhri Ishimaru; Nobuo Arimoto

doi:10.1093/pasj/49.1.1

paper

Roles of SNIa and SNII in ICM Enrichment

arXiv:astro-ph/9702036 · doi:10.1093/pasj/49.1.1

Abstract

Based on ASCA observations Mushotzky et al. (1996, ApJ 466, 686) have recently derived the relative-abundance ratios of $α$ -elements to iron, [α/Fe] \simeq 0.2-0.3 $, f or f o u r r i c h c l u s t er s, an d ha v es ug g es t e d t ha tt h eor i g in o f m e t a l s inanin t r a - c l u s t er m e d i u m (I C M) i s n o t a t y p e - I a s u p er n o v a e (S N I a), b u t a t y p e - I I s u p er n o v a e (S N I I) . H o w e v er, t h ese a u t h or s u se d t h eso l a r p h o t os p h er i c i r o nab u n d an ce f or A S C A d a t a r e d u c t i o n, w hi l e t h e m e t eor i t i c i r o nab u n d an ce i s u s u a l l y a d o pt e d in c h e mi c a l - e v o l u t i o n s t u d i es . I t i s t r u e t ha t a l t h o ug h t h e p h o t os p h er i c an d m e t eor i t i cso l a r ab u n d an ces a r eco n s i s t e n t f or m os t o f t h ee l e m e n t s, a ser i o u s d i scr e p an cy i s k n o w n t oe x i s t f or i r o n; in d ee d, t h e p h o t os p h er i c ab u n d an ceo f i r o ni s$ N_{Fe}/N_H = 4.68 10^{-5} $b y n u mb er, w hi l e t h e m e t eor i t i c v a l u e i s$ 3.24 10^{-5} $. T h e a r g u m e n t co n cer nin g t h er e l a t i v er o l eso f S N I aan d S N I I in I C M e n r i c hm e n t i s q u i t ese n s i t i v e t o t h e p r ec i se v a l u eso f [α / F e], an d o n es h o u l d u se ani d e n t i c a l so l a r i r o nab u n d an ce in d a t a r e d u c t i o na s w e l l a s in t h eor e t i c a l a r g u m e n t s . W e t h er e f or e a d o ptt h e m e t eor i t i c i r o nab u n d an ce, w hi c hi sco n s i s t e n tw i t h c h e mi c a l - e v o l u t i o n s t u d i es, an d s hi f tM u s h o t z k y e t a l .^{'} s A S C A d a t ab y$ Δ[α/Fe] \simeq -0.16$ dex. By comparing the corrected [α/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 favoured based on the ASCA spectra.

8 pages, 2 figures, requires PASJ LaTeX macros. To appear in PASJ

Roles of SNIa and SNII in ICM Enrichment

Abstract

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