Old Stellar Populations. VI. Absorption-Line Spectra of Galaxy Nuclei and Globular Clusters
Old Stellar Populations. VI. Absorption-Line Spectra of Galaxy Nuclei and Globular Clusters
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DOI：
10.1086/313099
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发表时间：
1997-12
期刊：
影响因子：
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通讯作者：
Scott Trager;Scott Trager;G. Worthey;G. Worthey;S. M. Faber;D. Burstein;Julian Gonzalez
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文献类型：
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作者：
Scott Trager;Scott Trager;G. Worthey;G. Worthey;S. M. Faber;D. Burstein;Julian Gonzalez
本文给出了4000-6400 μ m区域内381个星系和38个球状星团的Lick/IDS线强度系统的吸收线强度。所有的星系都是在1972年至1984年之间在利克天文台用卡塞格伦析像扫描摄谱仪观测到的，这使得这项研究成为迄今为止最大的星系谱线数据的均匀收集之一。我们还提出了一个目录的核速度色散用于校正恒星舔/IDS系统的吸收线强度。Lick/IDS系统的随机误差和系统误差的广泛讨论。指数可以分为三个家族：与速度弥散度正相关的类α元素指数（包括CN、Mg、Na D和TiO 2）;与速度弥散度和α指数弱相关的类Fe指数（包括Ca、G带、TiO 1和所有Fe指数）;与速度弥散度和α指数弱相关的Hβ。C24668似乎介于α和Fe族之间。这些分组可能代表了不同的元素丰度家族与不同的核合成历史。
We present absorption-line strengths on the Lick/IDS line-strength system of 381 galaxies and 38 globular clusters in the 4000-6400 Å region. All galaxies were observed at Lick Observatory between 1972 and 1984 with the Cassegrain Image Dissector Scanner spectrograph, which makes this study one of the largest homogeneous collections of galaxy spectral line data to date. We also present a catalog of nuclear velocity dispersions used to correct the absorption-line strengths onto the stellar Lick/IDS system. Extensive discussion of both random and systematic errors of the Lick/IDS system is provided. Indices are seen to fall into three families: α-element-like indices (including CN, Mg, Na D, and TiO2) that correlate positively with velocity dispersion; Fe-like indices (including Ca, the G band, TiO1, and all Fe indices) that correlate only weakly with velocity dispersion and the α indices; and Hβ that anticorrelates with both velocity dispersion and the α indices. C24668 seems to be intermediate between the α and Fe groups. These groupings probably represent different element abundance families with different nucleosynthesis histories.