基于颜色的206个星系的星族年龄与金属丰度研究

Study of the ages and metallicities of 206 galaxies using colours

基于颜色分别采用单星星族模型和双星星族模型对206个星系的年龄和金属丰度进行了确定,并将2种结果和Gallazzi等人用谱指数得到的结果进行了比较.结果表明:样本星系的年龄比较老,金属丰度比较高;使用双星星族模型拟合得到的星族年龄和金属丰度比单星星族的偏大;使用颜色拟合得到的星族年龄比谱指数的偏小,金属丰度偏大.

Ages and metallicities of 206 galaxies are determined by ssSSPs and binary-star stellar population synthesis models（bsSSPs） respectively on the basis of colours in this article.Then the results are compared and they are compared with the results accquired by Gallazzi et al using lick indices.The results show that：the sample galaxies are old and metal-high.Larger ages and metallicities are obtained when bsSSPs models are used to determine the ages and metallicities of galaxies.When colours are used to determine the ages and metallicities of galaxies,smaller ages and larger metallicities are obtained.