Stellar Populations of Elliptical Galaxies in Virgo Cluster. I. The Data and Stellar Population Analysis
Stellar Populations of Elliptical Galaxies in Virgo Cluster. I. The Data and Stellar Population Analysis
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DOI：
10.1086/498252
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发表时间：
2005-11
期刊：
影响因子：
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通讯作者：
Y. Yamada;N. Arimoto;A. Vazdekis;R. Peletier
中科院分区：
文献类型：
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作者：
Y. Yamada;N. Arimoto;A. Vazdekis;R. Peletier
我们利用高信噪比的光谱（S/N bbb100 Å-1）确定了室女座星系团中椭圆星系的光谱年龄。我们用斯巴鲁望远镜观测到了8个星系，并将这个样本与之前用WHT观测到的6个星系结合起来。为了确定它们的年龄，我们使用了一种基于h - γσ年龄指标的新方法，该方法几乎不受金属丰度的影响。除了年龄，我们还估计了各种元素的丰度。本文介绍了h - γσ法的观测结果、数据约简和可靠性。这项调查的结果在一篇配套论文中提出。
We have determined spectroscopic ages of elliptical galaxies in the Virgo Cluster using spectra of very high signal-to-noise ratio (S/N > 100 Å-1). We observed eight galaxies with the Subaru Telescope and have combined this sample with six galaxies previously observed with the WHT. To determine their ages, we have used a new method based on the Hγσ age indicator, which is virtually independent of the effects of metallicity. Apart from ages we have estimated abundances of various elements. In this paper we present the observations, the data reduction, and the reliability of the Hγσ method. The results of this investigation are presented in a companion paper.