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• W3100611936 endingPage "184" @default.
• W3100611936 startingPage "184" @default.
• W3100611936 abstract "We examine the spectrum in the vicinity of the NH3360 index of Davidge & Clark, which was defined to measure the NH absorption around 3360 Å and shows almost no trend with velocity dispersion, unlike other N-sensitive indices, which show a strong trend. Computing the effect of individual elements on the integrated spectrum with synthetic stellar population integrated spectra, we find that, while being well correlated with nitrogen abundance, NH3360 is almost equally well anti-correlated with Mg abundance. This prompts the definition of two new indices, Mg3334, which is mostly sensitive to magnesium, and NH3375, which is mostly sensitive to nitrogen. Rather surprisingly, we find that the new NH3375 index shows a trend versus optical absorption feature indices that is as shallow as the NH3360 index. We hypothesize that the lack of a strong index trend in these near-UV indices is due to the presence of an old metal-poor component of the galactic population. Comparison of observed index trends and those predicted by models shows that a modest fraction of an old, metal-poor stellar population could easily account for the observed flat trend in these near-UV indices while still allowing substantial N abundance increase in the larger galaxies." @default.
• W3100611936 created "2020-11-23" @default.
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• W3100611936 date "2011-05-04" @default.
• W3100611936 modified "2023-09-30" @default.
• W3100611936 title "NH AND Mg INDEX TRENDS IN ELLIPTICAL GALAXIES" @default.
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• W3100611936 doi "https://doi.org/10.1088/0004-6256/141/6/184" @default.
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