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SPECTRAL VARIATIONS IN EARLYTYPE GALAXIES AS A FUNCTION OF MASS

机译:早期星系的光谱变化作为质量的函数

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We report on the strengths of three spectral indicators-Mg_2,, Hβ, and Hn/Fe--in the integrated light of a sample of l00 field and cluster E/S0 galaxies. The measured indices are sensitive to age and/or metallicity variations within the galaxy sample. Using linear regression analysis fOr data with nonuniform errors, we determine the intrinsic scatter present among the spectral indices of our galaxy sample as a function of internal velocity dispersion. Our analysis demonstrates that there is significantly more intrinsic scatter in the two Balmer line indices than in the Mg, index, indicating that the Balmer indices provide more dynamic range in determining the age of a stellar population than does the Mg, index. Furthermore, the scatter is much larger for the low velocity dispersion galaxies, indicating that star formation has occurred more recently in the lower mass galaxies.
机译:我们报告了三种光谱指标-Mg_2,Hβ和Hn / Fe的强度,这些强度是在100场和E / S0星系星团的样本的积分光中得出的。测得的指数对星系样本中的年龄和/或金属性变化敏感。使用具有非均匀误差的数据进行线性回归分析,我们确定了存在于我们银河系样本光谱指数之间的固有散射与内部速度色散的关系。我们的分析表明,两个Balmer线指数比Mg。指数有更多的内在散射,这表明Balmer指数比Mg。指数提供更多的动态范围来确定恒星种群的年龄。此外,低速色散星系的散射更大,表明最近在质量较低的星系中出现了恒星形成。

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