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Photometric Metallicity of the Sagittarius Stream in the south Galactic cap

Published online by Cambridge University Press:  09 May 2016

Cuihua Du ,
Jiayin Gu ,
Yunpeng Jia ,
Xiyan Peng ,
Zhenyu Wu ,
Jun Ma ,
Xu Zhou  and
Yanchun Liang
Cuihua Du
Affiliation:
School of physics sciences, University of the Chinese Academy of Sciences, Beijing 100049, China email: ducuihua@ucas.ac.cn
Jiayin Gu
Affiliation:
School of physics sciences, University of the Chinese Academy of Sciences, Beijing 100049, China email: ducuihua@ucas.ac.cn
Yunpeng Jia
Affiliation:
Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
Xiyan Peng
Affiliation:
Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
Zhenyu Wu
Affiliation:
Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
Jun Ma
Affiliation:
Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
Xu Zhou
Affiliation:
Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
Yanchun Liang
Affiliation:
Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
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Abstract

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Based on SDSS and South Galactic Cap U-band Sky Survey (SCUSS) photometry, we try to study the photometric metallicity of the Sagittarius (Sgr) stream in the south Galactic cap. We find that the Sgr stream has a wider metallicity distribution, and that its median metallicity is richer than that of the field halo stars. The neighboring field halo stars in our studied fields can be modeled by a two-Gaussian model, with peaks at [Fe/H]= −1.9 and [Fe/H]= −1.5. The metallicity distribution function (MDF) of the mixed population (Sgr stream and halo stars) has peaks at [Fe/H]= −1.9, [Fe/H]= −1.5 and [Fe/H]= −0.5, respectively.

Keywords

Galaxy: metallicity - Galaxy: stellar content - Galaxy: halo
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Issue S317: The General Assembly of Galaxy Halos: Structure, Origin and Evolution , August 2015 , pp. 294 - 295
Copyright
Copyright © International Astronomical Union 2016 

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