The Substructures in the Local Stellar Halo from Gaia and LAMOST

doi:10.3847/1538-4357/ab06f4

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	The Substructures in the Local Stellar Halo from Gaia and LAMOST
	Li,Hefan 2; Du,Cuihua 3,4; Liu,Shuai 1; Thomas Donlon,4; Newberg,Heidi Jo 4
刊名	The Astrophysical Journal
	2019-03-26
卷号	874 期号:1
关键词	Galaxy: halo Galaxy: kinematics and dynamics solar neighborhood
ISSN号	0004-637X
DOI	10.3847/1538-4357/ab06f4
英文摘要	Abstract Based on the second Gaia data release and spectroscopy from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope Data, we identified 20,089 halo stars kinematically and chemically. The halo streams in the solar neighborhood could be detected in the space of energy and angular momentum. We reshuffle the velocities of these stars to determine the significance of substructure. Finally, we identify four statistically significant substructures that are labeled GL-1 through 4. Among these substructures, GL-1 is a previously known stream (“N2” stream), and the other three substructures are new. These substructures may be the debris of dwarf galaxy accretion event; their dynamical and chemical information can help us to understand the history of the Milky Way.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-874-1-AB06F4
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/25651]
专题	中国科学院国家天文台
作者单位	1.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China 2.School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China 3.College of Astronomy and Space Sciences, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China; ducuihua@ucas.ac.cn 4.Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
推荐引用方式 GB/T 7714	Li,Hefan,Du,Cuihua,Liu,Shuai,et al. The Substructures in the Local Stellar Halo from Gaia and LAMOST[J]. The Astrophysical Journal,2019,874(1).
APA	Li,Hefan,Du,Cuihua,Liu,Shuai,Thomas Donlon,,&Newberg,Heidi Jo.(2019).The Substructures in the Local Stellar Halo from Gaia and LAMOST.The Astrophysical Journal,874(1).
MLA	Li,Hefan,et al."The Substructures in the Local Stellar Halo from Gaia and LAMOST".The Astrophysical Journal 874.1(2019).