期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 362, 期 1, 页码 2-8出版社
BLACKWELL PUBLISHING
DOI: 10.1111/j.1365-2966.2005.09288.x
关键词
galaxies : clusters : individual : coma; galaxies : elliptical and lenticular; cD galaxies : stellar content
We investigate the effect of a low-level contamination of hot, old, metal-poor starlight on the inferred stellar populations of early-type galaxies in the core of the Coma Cluster. We find that the required correction to the Balmer and metal absorption-line strengths for old, metal-poor stars does not significantly affect the inferred age of the stellar population when the HP strength is large. Intermediate-aged populations are therefore still needed to explain enhanced Balmer-line strengths in early-type galaxies. This gives us increased confidence in our age estimates for these objects. For galaxies with weak Balmer-line strengths corresponding to very old populations (t > 10 Gyr), however, a correction for hot stars may indeed alter the inferred age, as previously suggested. Finally, the inferred metallicity [Z/H] will always be higher after any correction for old, metal-poor starlight than if it were not taken into account, but the enhancement ratios [E/Fe] will strengthen only slightly.
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