| 基于SCUSS和SDSS数据的银河系晕金属丰度分布 |
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| 引用本文： | 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. DOI: 10.7523/j.issn.2095-6134.2018.04.007 |
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| 作者姓名： | 左文波 杜翠花 |
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| 作者单位： | 中国科学院大学物理科学学院, 北京 101408 |
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| 基金项目： | 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 |
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| 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。
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| 关 键 词： | 银河系晕 测光金属丰度 星系结构 |
| 收稿时间： | 2017-03-21 |
| 修稿时间： | 2017-05-04 |
Photometric metallicity of the galactic halo based on SCUSS and SDSS |
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| ZUO Wenbo,DU Cuihua. Photometric metallicity of the galactic halo based on SCUSS and SDSS[J]. , 2018, 35(4): 468-472. DOI: 10.7523/j.issn.2095-6134.2018.04.007 |
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| Authors: | ZUO Wenbo DU Cuihua |
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| Affiliation: | School of Physics Sciences, University of Chinese Academy of Sciences, Beijing 101408, China |
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| 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. |
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| Keywords: | galactic halo metallicity galactic structure |
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