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Identifying Galactic Halo Substructure in 6D Phase Space Using similar to 13,000 LAMOST K Giants

文献类型：期刊论文

作者Yang, Chengqun1,2; Xue, Xiang-Xiang1; Li, Jing3,4; Zhang, Lan1; Liu, Chao1,2; Zhao, Gang1,2; Chang, Jiang1; Tian, Hao1; Li, Chengdong1,2
刊名ASTROPHYSICAL JOURNAL
出版日期2019-07-20
卷号880期号:1页码:15
关键词Galaxy: evolution Galaxy: formation Galaxy: halo Galaxy: kinematics and dynamics
ISSN号0004-637X
DOI10.3847/1538-4357/ab2462
英文摘要We construct a large halo K-giant sample by combining the positions, distances, radial velocities, and metallicities of over 13,000 LAMOST DR5 halo K giants with the Gaia DR2 proper motions, which covers a Galactocentric distance range of 5-120 kpc. Using a position-velocity clustering estimator (the 6Distance), we statistically quantify the presence of position-velocity substructure at high significance: K giants have more close pairs in position-velocity space than a smooth stellar halo. We find that the amount of substructure in the halo increases with increasing distance and metallicity. With a percolation algorithm named friends-of-friends to identify groups, we identify members belonging to Sagittarius (Sgr) Streams, Monoceros Ring, Virgo Overdensity, Hercules-Aquila Cloud, Orphan Streams, and other unknown substructures and find that the Sgr streams account for a large part of grouped stars beyond 20 kpc and enhance the increase of substructure with distance and metallicity. For the first time, we identify spectroscopic members of Monoceros Ring in the southern and northern Galactic hemispheres, which presents a rotation of about 185 km s(-1) and a mean metallicity of -0.66 dex.
WOS关键词DIGITAL SKY SURVEY ; SAGITTARIUS DWARF GALAXY ; LARGE-SCALE STRUCTURE ; MILKY-WAY ; STELLAR HALO ; CANIS MAJOR ; STREAM ; KINEMATICS ; ACCRETION ; STARS
资助项目National Natural Science Foundation of China[11873052] ; National Natural Science Foundation of China[11890694] ; National Natural Science Foundation of China[11573032] ; National Natural Science Foundation of China[11773033] ; NSFC[11703019] ; NSFC[11703038] ; NSFC[11333003] ; NSFC[11390372] ; National Development and Reform Commission
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000477645800010
出版者IOP PUBLISHING LTD
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission
源URL[http://ir.bao.ac.cn/handle/114a11/27184]  
专题中国科学院国家天文台
通讯作者Yang, Chengqun
作者单位1.Chinese Acad Sci, Natl Astron Observ, 20A Datun Rd, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Sch Astron & Space Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
3.China West Normal Univ, Phys & Space Sci Coll, 1 ShiDa Rd, Nanchong 637002, Peoples R China
4.Chinese Acad Sci, SHAO, Nandan Rd, Shanghai 200030, Peoples R China
推荐引用方式
GB/T 7714		 Yang, Chengqun,Xue, Xiang-Xiang,Li, Jing,et al. Identifying Galactic Halo Substructure in 6D Phase Space Using similar to 13,000 LAMOST K Giants[J]. ASTROPHYSICAL JOURNAL,2019,880(1):15.
APA Yang, Chengqun.,Xue, Xiang-Xiang.,Li, Jing.,Zhang, Lan.,Liu, Chao.,...&Li, Chengdong.(2019).Identifying Galactic Halo Substructure in 6D Phase Space Using similar to 13,000 LAMOST K Giants.ASTROPHYSICAL JOURNAL,880(1),15.
MLA Yang, Chengqun,et al."Identifying Galactic Halo Substructure in 6D Phase Space Using similar to 13,000 LAMOST K Giants".ASTROPHYSICAL JOURNAL 880.1(2019):15.

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来源：国家天文台

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