591 High-velocity Stars in the Galactic Halo Selected from LAMOST DR7 and Gaia DR2 | |
Li, Yin-Bi1; Luo, A-Li1,14; Lu, You-Jun1,14; Zhang, Xue-Sen2; Li J(李蛟)1,3; Wang, Rui1; Zuo, Fang1,14; Xiang,Maosheng4; Ting,Yuan-Sen5,6,8,9; Marchetti,Tommaso10 | |
刊名 | The Astrophysical Journal Supplement Series |
2021-01 | |
卷号 | 252期号:1页码:19 |
关键词 | High-velocity stars |
ISSN号 | 0067-0049 |
DOI | 10.3847/1538-4365/abc16e |
产权排序 | 第4完成单位 |
文献子类 | Article |
英文摘要 | In this paper, we report 591 high-velocity star candidates (HiVelSCs) selected from over 10 million spectra of Data Release 7 (DR7) of the Large Sky Area Multi-object Fiber Spectroscopic Telescope and the second Gaia data release, with three-dimensional velocities in the Galactic rest frame larger than 445 km s?1. We show that at least 43 HiVelSCs are unbound to the Galaxy with escape probabilities larger than 50%, and this number decreases to eight if the possible parallax zero-point error is corrected. Most of these HiVelSCs are metal-poor and slightly α-enhanced inner halo stars. Only 14% of them have [Fe/H]?>??1, which may be the metal-rich “in situ” stars in the halo formed in the initial collapse of the Milky Way or metal-rich stars formed in the disk or bulge but kinematically heated. The low ratio of 14% implies that the bulk of the stellar halo was formed from the accretion and tidal disruption of satellite galaxies. In addition, HiVelSCs on retrograde orbits have slightly lower metallicities on average compared with those on prograde orbits; meanwhile, metal-poor HiVelSCs with [Fe/H]? |
学科主题 | 天文学 ; 星系与宇宙学 ; 恒星与银河系 |
URL标识 | 查看原文 |
出版地 | TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND |
资助项目 | Chinese Space Station Telescope (CSST) pre-research projects of Key Problems in Binaries and Chemical Evolution of the Milky Way and its Nearby Galaxies ; National Key R&D Program of China[2019YFA0405502] ; National Natural Science Foundation of China[U1931209] ; National Natural Science Foundation of China[11873056] ; National Natural Science Foundation of China[11991052] ; National Natural Science Foundation of China[11988101] ; National Natural Science Foundation of China[11890694] ; National Natural Science Foundation of China[11673058] ; National Natural Science Foundation of China[11873016] ; National Key Program for Science and Technology Research and Development[2016YFA0400704] ; Cultivation Project for LAMOST Scientific Payoff and Research Achievement of CAMS-CAS ; key research program of frontier sciences, CAS[ZDBS-LY7005] ; NASA Hubble Fellowship - Space Telescope Science Institute[HST-HF2-51425.001] ; National Development and Reform Commission |
WOS关键词 | METAL-POOR STARS ; 1ST DATA RELEASE ; HYPERVELOCITY STARS ; STELLAR HALO ; BLACK-HOLE ; GLOBULAR-CLUSTER ; BETA PHOTOMETRY ; THICK DISKS ; ORIGIN ; KINEMATICS |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | IOP PUBLISHING LTD |
WOS记录号 | WOS:000599779500001 |
资助机构 | Chinese Space Station Telescope (CSST) pre-research projects of Key Problems in Binaries and Chemical Evolution of the Milky Way and its Nearby Galaxies ; National Key R&D Program of China[2019YFA0405502] ; National Natural Science Foundation of China[U1931209, 11873056, 11991052, 11988101, 11890694, 11673058, 11873016] ; National Key Program for Science and Technology Research and Development[2016YFA0400704] ; Cultivation Project for LAMOST Scientific Payoff and Research Achievement of CAMS-CAS ; key research program of frontier sciences, CAS[ZDBS-LY7005] ; NASA Hubble Fellowship - Space Telescope Science Institute[HST-HF2-51425.001] ; National Development and Reform Commission |
内容类型 | 期刊论文 |
源URL | [http://ir.ynao.ac.cn/handle/114a53/24009] |
专题 | 云南天文台_大样本恒星演化研究组 |
通讯作者 | Luo, A-Li |
作者单位 | 1.CAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People's Republic of China 2.ExtantFuture (Beijing) Technology Co., Ltd, Beijing 100102, People's Republic Of China 3.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, People's Republic of China 4.Max-Planck Institute for Astronomy, Konigstuhl 17, D-69117 Heidelberg, Germany 5.Institute for Advanced Study, Princeton, NJ 08540, USA 6.Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08540, USA 7.Institute of Statistical Mathematics, 10-3 Midoricho, Tachikawa, Tokyo 190-0014, Japan 8.Observatories of the Carnegie Institution of Washington, 813 Santa Barbara St., Pasadena, CA 91101, USA 9.Research School of Astronomy & Astrophysics, Australian National University, Cotter Rd., Weston, ACT 2611, Australia 10.European Southern Observatory, Karl Schwarzschild-Strasse 2, 85748 Garching bei Munchen, Germany |
推荐引用方式 GB/T 7714 | Li, Yin-Bi,Luo, A-Li,Lu, You-Jun,et al. 591 High-velocity Stars in the Galactic Halo Selected from LAMOST DR7 and Gaia DR2[J]. The Astrophysical Journal Supplement Series,2021,252(1):19. |
APA | Li, Yin-Bi.,Luo, A-Li.,Lu, You-Jun.,Zhang, Xue-Sen.,Li J.,...&Zhao, Gang.(2021).591 High-velocity Stars in the Galactic Halo Selected from LAMOST DR7 and Gaia DR2.The Astrophysical Journal Supplement Series,252(1),19. |
MLA | Li, Yin-Bi,et al."591 High-velocity Stars in the Galactic Halo Selected from LAMOST DR7 and Gaia DR2".The Astrophysical Journal Supplement Series 252.1(2021):19. |
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