Iron Abundance Discrepancy in Ellipticals after ASCA
The chemical composition of the ISM is expected to reflect the average composition of the stellar component as established at the time of its formation, then further enriched by SN’s of Type Ia that are known to currently explode in elliptical galaxies. Renzini et al. (1993) estimate the expected iron abundance in the hot ISM of elliptical galaxies to range from a minimum of ~ 2 times solar, to perhaps as much as ~ 5 times solar or more, depending on the adopted SNIa’s rate.
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