基于SCUSS和SDSS数据的银河系晕金属丰度分布

doi:10.7523/j.issn.2095-6134.2018.04.007

中国科学院大学学报 ›› 2018, Vol. 35 ›› Issue (4): 468-472.DOI: 10.7523/j.issn.2095-6134.2018.04.007

基于SCUSS和SDSS数据的银河系晕金属丰度分布

左文波, 杜翠花

中国科学院大学物理科学学院, 北京 101408

收稿日期:2017-03-21 修回日期:2017-05-04 发布日期:2018-07-15
通讯作者: 杜翠花
基金资助:
国家自然科学基金委员会-中国科学院天文联合基金（U1231113）和中国科学院大学校所合作基金资助

Photometric metallicity of the galactic halo based on SCUSS and SDSS

ZUO Wenbo, DU Cuihua

School of Physics Sciences, University of Chinese Academy of Sciences, Beijing 101408, China

Received:2017-03-21 Revised:2017-05-04 Published:2018-07-15

摘要/Abstract

摘要： 基于SCUSS u波段测光数据和SDSS g、r波段测光数据，根据F/G型主序星金属丰度与u-g和g-r色指数的相关性，运用蒙特卡罗方法模拟银河系晕的金属丰度分布。筛选晕中的F/G型主序星并按柱坐标分区间Z<-10 kpc，Z<-12 kpc，和Z<-15 kpc研究。样本的[Ee/H]分布可用三峰高斯模型拟合且模型的峰值位于[Ee/H]~-0.60，-1.55，和-2.20。经对比分析，发现两个贫金属峰是内外晕的贡献，而较富的成分则对应晕中子结构的影响。

关键词: 银河系晕, 测光金属丰度, 星系结构

Abstract: Based on the correlation between[Fe/H] of F-/G-type main-sequence star and color index, we simulate the distribution of metallicity of the halo star using Monte-Carlo method based on u-g and g-r from SCUSS and SDSS. We select F-/G-type main-sequence star in halo as tracer and study the sample in the Z<-10 kpc,Z<-12 kpc, and Z<-15 kpc intervals, where Z represents the distance of the star from the galactic plane. The metallicity distribution of selected stars in every interval can be fitted by three-Gaussian model, with peaks at[Fe/H]~-0.60,-1.55, and -2.20. Based on our analysis, we find that the two components with metal-poor peaks are associated with the inner and outer halo and the metal-rich component is contributed by substructure in the halo.

Key words: galactic halo, metallicity, galactic structure

中图分类号:

P156.5

左文波, 杜翠花. 基于SCUSS和SDSS数据的银河系晕金属丰度分布[J]. 中国科学院大学学报, 2018, 35(4): 468-472.

ZUO Wenbo, DU Cuihua. Photometric metallicity of the galactic halo based on SCUSS and SDSS[J]. , 2018, 35(4): 468-472.

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基于SCUSS和SDSS数据的银河系晕金属丰度分布

Photometric metallicity of the galactic halo based on SCUSS and SDSS

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