Detecting the Sagittarius Stream with LAMOST DR4 M Giants and Gaia DR2
文献类型：期刊论文
| 作者 | Li,Jing2,3; Liu,Chao4 ; Xue,Xiangxiang4; Zhong,Jing3; Weiss,Jake1; Carlin,Jeffrey L.5; Tian,Hao4
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| 刊名 | The Astrophysical Journal
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| 出版日期 | 2019-04-01 |
| 卷号 | 874期号:2 |
| ISSN号 | 0004-637X |
| 关键词 | galaxies: individual (Sagittarius dSph) Galaxy: halo Galaxy: structure stars: abundances stars: distances stars: late-type |
| DOI | 10.3847/1538-4357/ab09ef |
| 英文摘要 | Abstract We use LAMOST DR4 M giants combined with Gaia DR2 proper motions and ALLWISE photometry to obtain an extremely pure sample of Sagittarius (Sgr) stream stars. Using TiO5 and CaH spectral indices as indicators, we selected a large sample of M-giant stars from M-dwarf stars in LAMOST DR4 spectra. Considering the position, distance, proper motion, and angular momentum distribution, we obtained 164 pure Sgr stream stars. We find that the trailing arm has higher energy than the leading arm in the same angular momentum. The trailing arm we detected extends to a heliocentric distance of ～130 kpc at Λ ? ⊙ ～ 170 ° , which is consistent with the feature found in RR Lyrae in Sesar et al. Both of these detections of Sgr, in M-giants and in RR Lyrae, imply that the Sgr stream may contain multiple stellar populations with a broad metallicity range. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-874-2-AB09EF |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/25657]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, 110 Eighth Street, Troy, NY 12180, USA 2.Physics and Space Science College,China West Normal University, 1 ShiDa Road, Nanchong 637002, People’s Republic of China; lijing@shao.ac.cn 3.SHAO, Chinese Academy of Sciences, Nandan Road, Shanghai 200030, People’s Republic of China 4.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Datun Road 20A, Beijing 100012, People’s Republic of China 5.LSST, 950 North Cherry Avenue, Tucson, AZ 85719, USA |
| 推荐引用方式 GB/T 7714 | Li,Jing,Liu,Chao,Xue,Xiangxiang,et al. Detecting the Sagittarius Stream with LAMOST DR4 M Giants and Gaia DR2[J]. The Astrophysical Journal,2019,874(2). |
| APA | Li,Jing.,Liu,Chao.,Xue,Xiangxiang.,Zhong,Jing.,Weiss,Jake.,...&Tian,Hao.(2019).Detecting the Sagittarius Stream with LAMOST DR4 M Giants and Gaia DR2.The Astrophysical Journal,874(2). |
| MLA | Li,Jing,et al."Detecting the Sagittarius Stream with LAMOST DR4 M Giants and Gaia DR2".The Astrophysical Journal 874.2(2019). |
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来源：国家天文台
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