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Vertical Structure of Galactic Disk Kinematics from LAMOST K Giants
Ding, Ping-Jie1; Xue, Xiang-Xiang1,2; Yang, Chengqun3; Zhao, Gang1,2; Zhang, Lan1; Zhu, Zi4,5
2021-09-01
Source PublicationASTRONOMICAL JOURNAL
ISSN0004-6256
Volume162Issue:3Pages:15
AbstractWe examine the vertical structure of Galactic disk kinematics over a Galactocentric radial distance range of R = 5-15 kpc and up to 3 kpc away from the Galactic plane, using the K-type giants surveyed by LAMOST. Based on robust measurements of three-dimensional velocity moments, a wobbly disk is detected in a phenomenological sense. An outflow dominates the radial motion of the inner disk, while in the outer disk there exist alternate outward and inward flows. The vertical bulk velocities is a combination of breathing and bending modes. A contraction-like breathing mode with amplitudes increasing with the distance to the plane and an upward bending mode dominate the vertical motion outside R-0, and there are reversed breathing and bending modes at R < R-0, with amplitudes much smaller than those outside R-0. The mean azimuthal velocity decreases with the increasing distance to the plane, with gradients shallower for larger R. Stars in the south disk are rotating faster than stars in the north. The velocity ellipsoid orientation differs between different R: in the range of 5 < R < 9 kpc, the gradient of the tilt angle with respect to arctan (Z/R) decreases from similar to 0.83 for the inner disk to similar to 0.52 for the outer disk; within 9 < R < 15 kpc, the tilt of velocity ellipsoid deviates from vertical antisymmetry. A clear flaring signature is found for both north and south disks based on the observed vertical structures of velocity ellipsoid.
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Development and Reform Commission ; National Development and Reform Commission ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Development and Reform Commission ; National Development and Reform Commission ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Development and Reform Commission ; National Development and Reform Commission ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Development and Reform Commission ; National Development and Reform Commission ; Chinese Academy of Sciences ; Chinese Academy of Sciences
DOI10.3847/1538-3881/ac0892
WOS KeywordDIGITAL SKY SURVEY ; MILKY-WAY ; DATA RELEASE ; 1ST DATA ; SOLAR NEIGHBORHOOD ; THICK DISKS ; TILT ; DISTANCES ; DYNAMICS ; STARS
Language英语
Funding ProjectNational Natural Science Foundation of China[11988101] ; National Natural Science Foundation of China[11873052] ; National Natural Science Foundation of China[11890694] ; National Natural Science Foundation of China[11773033] ; National Natural Science Foundation of China[11833004] ; National Key R&D Program of China[2019YFA0405500] ; National Development and Reform Commission ; Chinese Academy of Sciences
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Development and Reform Commission ; National Development and Reform Commission ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Development and Reform Commission ; National Development and Reform Commission ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Development and Reform Commission ; National Development and Reform Commission ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Development and Reform Commission ; National Development and Reform Commission ; Chinese Academy of Sciences ; Chinese Academy of Sciences
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000686338900001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/75896
Collection中国科学院国家天文台
Corresponding AuthorZhao, Gang
Affiliation1.Chinese Acad Sci, Natl Astron Observ, CAS Key Lab Opt Astron, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Sch Astron & Space Sci, 19A Yuquan Rd,Shijingshan Dist, Beijing 100049, Peoples R China
3.Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
4.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210023, Peoples R China
5.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210023, Peoples R China
Recommended Citation
GB/T 7714
Ding, Ping-Jie,Xue, Xiang-Xiang,Yang, Chengqun,et al. Vertical Structure of Galactic Disk Kinematics from LAMOST K Giants[J]. ASTRONOMICAL JOURNAL,2021,162(3):15.
APA Ding, Ping-Jie,Xue, Xiang-Xiang,Yang, Chengqun,Zhao, Gang,Zhang, Lan,&Zhu, Zi.(2021).Vertical Structure of Galactic Disk Kinematics from LAMOST K Giants.ASTRONOMICAL JOURNAL,162(3),15.
MLA Ding, Ping-Jie,et al."Vertical Structure of Galactic Disk Kinematics from LAMOST K Giants".ASTRONOMICAL JOURNAL 162.3(2021):15.
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