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Age-metallicity dependent stellar kinematics of the Milky Way disc from LAMOST and Gaia
Wu, Yaqian1,2; Xiang, Maosheng1,3; Chen, Yuqin1,4; Zhao, Gang1,4; Bi, Shaolan2; Li, Chengdong5; Li, Yaguang6,7; Huang, Yang8,9
2021-03-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume501Issue:4Pages:4917-4934
AbstractWe investigate the stellar kinematics of the Galactic disc in 7 < R < 13kpc using a sample of 118945 red giant branch (RGB) stars from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) and Gaia. We characterize the median, dispersion and skewness of the distributions of the three-dimensional stellar velocities, actions and orbital parameters across the age-metallicity and the disc R-Z plane. Our results reveal abundant but clear stellar kinematic patterns and structures in the age-metallicity and the disc R-Z plane. The most prominent features are the strong variations of the velocity, action and orbital parameter distributions from the young, metal-rich thin disc to the old, metal-poor thick disc; a number of smaller-scale structures (such as velocity streams, north-south asymmetries, and kinematic features of spiral arms) are clearly revealed. Particularly, the skewness of V-phi and J(phi) reveals a new substructure at R similar or equal to 12kpc and Z similar or equal to 0kpc, possibly related to dynamical effects of spiral arms in the outer disc. We further study the stellar migration by analysing the stellar orbital parameters and stellar birth radii. The results suggest that the thick disc stars near the solar radii and beyond are mostly migrated from the inner disc of R similar to 4-6kpc as a result of their highly eccentrical orbits. Stellar migration resulting from dynamical processes with angular momentum transfer (churning) is prominent for both the old, metal-rich stars (outward migrators) and the young metal-poor stars (inward migrators). The spatial distribution in the R-Z plane for the inward migrators born at a Galactocentric radius of >12kpc shows clear age stratifications, possibly evidence that these inward migrators are consequences of splashes triggered by merger events of satellite galaxies that have lasted the past few Gyr.
Keywordcatalogues disc galaxy: fundamental parameters galaxy: kinematics and dynamics
Funding OrganizationNational Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Joint Research Fund in Astronomy ; Joint Research Fund in Astronomy ; National Key R&D Program of China ; National Key R&D Program of China ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Joint Research Fund in Astronomy ; Joint Research Fund in Astronomy ; National Key R&D Program of China ; National Key R&D Program of China ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Joint Research Fund in Astronomy ; Joint Research Fund in Astronomy ; National Key R&D Program of China ; National Key R&D Program of China ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Joint Research Fund in Astronomy ; Joint Research Fund in Astronomy ; National Key R&D Program of China ; National Key R&D Program of China ; National Development and Reform Commission ; National Development and Reform Commission
DOI10.1093/mnras/staa3949
Language英语
Funding ProjectNational Natural Science Foundation of China (NSFC)[11988101] ; National Natural Science Foundation of China (NSFC)[11903044] ; National Natural Science Foundation of China (NSFC)[11890694] ; National Natural Science Foundation of China (NSFC)[11625313] ; National Natural Science Foundation of China (NSFC)[11703035] ; Joint Research Fund in Astronomy[U2031203] ; National Key R&D Program of China[2019YFA0405502] ; National Development and Reform Commission
Funding OrganizationNational Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Joint Research Fund in Astronomy ; Joint Research Fund in Astronomy ; National Key R&D Program of China ; National Key R&D Program of China ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Joint Research Fund in Astronomy ; Joint Research Fund in Astronomy ; National Key R&D Program of China ; National Key R&D Program of China ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Joint Research Fund in Astronomy ; Joint Research Fund in Astronomy ; National Key R&D Program of China ; National Key R&D Program of China ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Joint Research Fund in Astronomy ; Joint Research Fund in Astronomy ; National Key R&D Program of China ; National Key R&D Program of China ; National Development and Reform Commission ; National Development and Reform Commission
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000637320000018
PublisherOXFORD UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/78305
Collection中国科学院国家天文台
Corresponding AuthorWu, Yaqian; Xiang, Maosheng; Chen, Yuqin
Affiliation1.Chinese Acad Sci, Natl Astron Observ, CAS Key Lab Opt Astron, Beijing 100101, Peoples R China
2.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
3.Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
4.Univ Chinese Acad Sci Beijing, Sch Astron & Space Sci, Beijing 101408, Peoples R China
5.Clarendon Lab, Rudolf Peierls Ctr Theoret Phys, Parks Rd, Oxford OX1 3PU, England
6.Univ Sydney, Sch Phys, Sydney Inst Astron SIfA, Sydney, NSW 2006, Australia
7.Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
8.Yunnan Univ Kunming, South West Inst Astron Res, Kunming 650500, Yunnan, Peoples R China
9.Peking Univ, Dept Astron, Beijing 100871, Peoples R China
Recommended Citation
GB/T 7714
Wu, Yaqian,Xiang, Maosheng,Chen, Yuqin,et al. Age-metallicity dependent stellar kinematics of the Milky Way disc from LAMOST and Gaia[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2021,501(4):4917-4934.
APA Wu, Yaqian.,Xiang, Maosheng.,Chen, Yuqin.,Zhao, Gang.,Bi, Shaolan.,...&Huang, Yang.(2021).Age-metallicity dependent stellar kinematics of the Milky Way disc from LAMOST and Gaia.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,501(4),4917-4934.
MLA Wu, Yaqian,et al."Age-metallicity dependent stellar kinematics of the Milky Way disc from LAMOST and Gaia".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 501.4(2021):4917-4934.
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