A Glimpse of Satellite Galaxies in the Milky Way with the 2.5-meter Wide Field Survey Telescope (WFST): Bootes III and Draco
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866916811205771264 |
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| author | Yang, Chao Pan, Zhizheng Fang, Min Zheng, Xian Zhong Liu, Binyang Li, Guoliang Sun, Tian-Rui Jiang, Ji-An Zhang, Miaomiao Wan, Zhen Liu, Shuang Qu, Han Yang, Ji Kong, Xu Liu, Wenhao Shu, Yiping Chang, Jiang Wang, Tinggui Fan, Lulu Xue, Yongquan Luo, Wentao Zhang, Hongxin Lou, Zheng Zhao, Haibin Li, Bin Wang, Hairen Yao, Dazhi Wang, Jian Zhang, Hongfei Li, Feng Liu, Hao Liang, Ming Tang, Jinlong Zhang, Yuheng Qiao, Man Wen, Run Lyu, Zongfei |
| author_facet | Yang, Chao Pan, Zhizheng Fang, Min Zheng, Xian Zhong Liu, Binyang Li, Guoliang Sun, Tian-Rui Jiang, Ji-An Zhang, Miaomiao Wan, Zhen Liu, Shuang Qu, Han Yang, Ji Kong, Xu Liu, Wenhao Shu, Yiping Chang, Jiang Wang, Tinggui Fan, Lulu Xue, Yongquan Luo, Wentao Zhang, Hongxin Lou, Zheng Zhao, Haibin Li, Bin Wang, Hairen Yao, Dazhi Wang, Jian Zhang, Hongfei Li, Feng Liu, Hao Liang, Ming Tang, Jinlong Zhang, Yuheng Qiao, Man Wen, Run Lyu, Zongfei |
| contents | We carry out deep imaging of the Milky Way satellite galaxies, Bootes III and Draco, with WFST as one pilot observing program to demonstrate the capability of WFST. Combining catalogs with PS1 DR2 and Gaia DR3, we derive proper motions for candidate member stars in these two satellite galaxies over a 12-year time baseline, yielding uncertainties of ~1.8 mas/yr at 21 mag and ~3.0 mas/yr at 22 mag in the r band. The proper motions derived from bright and faint stars are consistent, indicating no significant variation in proper motion across stellar luminosity as these galaxies undergo tidal interactions with the MW. Meanwhile, we suggest that Bootes III represents the bound remnant of the progenitor galaxy that gave rise to the Styx stream, as evidenced by its elongated density profile and overdensity in both spatial and kinematic space. This is the first paper to use WFST to measure the proper motions of faint stars in Milky Way satellite galaxies. More detailed analyses will be presented in forthcoming papers from the wide field survey (WFS) program. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_20997 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A Glimpse of Satellite Galaxies in the Milky Way with the 2.5-meter Wide Field Survey Telescope (WFST): Bootes III and Draco Yang, Chao Pan, Zhizheng Fang, Min Zheng, Xian Zhong Liu, Binyang Li, Guoliang Sun, Tian-Rui Jiang, Ji-An Zhang, Miaomiao Wan, Zhen Liu, Shuang Qu, Han Yang, Ji Kong, Xu Liu, Wenhao Shu, Yiping Chang, Jiang Wang, Tinggui Fan, Lulu Xue, Yongquan Luo, Wentao Zhang, Hongxin Lou, Zheng Zhao, Haibin Li, Bin Wang, Hairen Yao, Dazhi Wang, Jian Zhang, Hongfei Li, Feng Liu, Hao Liang, Ming Tang, Jinlong Zhang, Yuheng Qiao, Man Wen, Run Lyu, Zongfei Astrophysics of Galaxies We carry out deep imaging of the Milky Way satellite galaxies, Bootes III and Draco, with WFST as one pilot observing program to demonstrate the capability of WFST. Combining catalogs with PS1 DR2 and Gaia DR3, we derive proper motions for candidate member stars in these two satellite galaxies over a 12-year time baseline, yielding uncertainties of ~1.8 mas/yr at 21 mag and ~3.0 mas/yr at 22 mag in the r band. The proper motions derived from bright and faint stars are consistent, indicating no significant variation in proper motion across stellar luminosity as these galaxies undergo tidal interactions with the MW. Meanwhile, we suggest that Bootes III represents the bound remnant of the progenitor galaxy that gave rise to the Styx stream, as evidenced by its elongated density profile and overdensity in both spatial and kinematic space. This is the first paper to use WFST to measure the proper motions of faint stars in Milky Way satellite galaxies. More detailed analyses will be presented in forthcoming papers from the wide field survey (WFS) program. |
| title | A Glimpse of Satellite Galaxies in the Milky Way with the 2.5-meter Wide Field Survey Telescope (WFST): Bootes III and Draco |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2506.20997 |