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Mapping the Galactic disc with the LAMOST and Gaia red clump sample: II. 3D asymmetrical kinematics of mono-age populations in the disc between 6-14 kpc
Wang, H-F1,2; Lopez-Corredoira, M.3,4; Huang, Y.1; Carlin, J. L.5; Chen, B-Q1; Wang, C.6,7; Chang, J.8,9; Zhang, H-W6,7; Xiang, M-S8,10; Yuan, H-B11; Sun, W-X1; Li, X-Y1; Yang, Y.1; Deng, L-C2,8
2020
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume491Issue:2Pages:2104-2118
Corresponding AuthorWang, H-F(hfwang@bao.ac.cn)
AbstractWe perform analysis of the 3D kinematics of Milky Way disc stars in mono-age populations. We focus on stars between Galactocentric distances of R = 6 and 14 kpc, selected from the combined LAMOST Data Release 4 (DR4) red clump giant stars and Gaia DR2 proper motion catalogue. We confirm the 3D asymmetrical motions of recent works and provide time tagging of the Galactic outer disc asymmetrical motions near the anticentre direction out to Galactocentric distances of 14 kpc. Radial Galactocentric motions reach values up to 10 km s(-1), depending on the age of the population, and present a north-south asymmetry in the region corresponding to density and velocity substructures that were sensitive to the perturbations in the early 6 Gyr. After that time, the disc stars in this asymmetrical structure have become kinematically hotter, and are thus not sensitive to perturbations, and we find the structure is a relatively younger population. With quantitative analysis, we find stars both above and below the plane at R greater than or similar to 9 kpc that exhibit bending mode motions of which the sensitive duration is around 8 Gyr. We speculate that the in-plane asymmetries might not be mainly caused by a fast rotating bar, intrinsically elliptical outer disc, secular expansion of the disc, or streams. Spiral arm dynamics, out-of-equilibrium models, minor mergers or others are important contributors. Vertical motions might be dominated by bending and breathing modes induced by complicated inner or external perturbers. It is likely that many of these mechanisms are coupled together.
KeywordGalaxy: disc Galaxy: kinematics and dynamics Galaxy: structure
DOI10.1093/mnras/stz3113
WOS KeywordGIANT BRANCH STARS ; MILKY-WAY DISC ; VELOCITY DISTRIBUTION ; SOLAR NEIGHBORHOOD ; ANGULAR-MOMENTUM ; MINOR MERGERS ; PATTERN SPEED ; SPIRAL ARMS ; LOCAL DISC ; STELLAR
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000512302100043
PublisherOXFORD UNIV PRESS
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/36501
Collection中国科学院紫金山天文台
Corresponding AuthorWang, H-F
Affiliation1.Yunnan Univ, South Western Inst Astron Res, Kunming 650500, Yunnan, Peoples R China
2.China West Normal Univ, Dept Astron, Nanchong 637009, Peoples R China
3.Inst Astrofis Canarias, E-38205 Tenerife, Spain
4.Univ La Laguna, Dept Astrofis, E-38206 San Cristobal la Laguna, Spain
5.LSST, 950 North Cherry Ave, Tucson, AZ 85719 USA
6.Peking Univ, Dept Astron, Beijing 100871, Peoples R China
7.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
8.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
9.Purple Mt Observ, Partner Grp MPI Astron, 2 West Beijing Rd, Nanjing 210008, Peoples R China
10.Max Planck Inst Astron, D-69117 Heidelberg, Germany
11.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
Recommended Citation
GB/T 7714
Wang, H-F,Lopez-Corredoira, M.,Huang, Y.,et al. Mapping the Galactic disc with the LAMOST and Gaia red clump sample: II. 3D asymmetrical kinematics of mono-age populations in the disc between 6-14 kpc[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2020,491(2):2104-2118.
APA Wang, H-F.,Lopez-Corredoira, M..,Huang, Y..,Carlin, J. L..,Chen, B-Q.,...&Deng, L-C.(2020).Mapping the Galactic disc with the LAMOST and Gaia red clump sample: II. 3D asymmetrical kinematics of mono-age populations in the disc between 6-14 kpc.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,491(2),2104-2118.
MLA Wang, H-F,et al."Mapping the Galactic disc with the LAMOST and Gaia red clump sample: II. 3D asymmetrical kinematics of mono-age populations in the disc between 6-14 kpc".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 491.2(2020):2104-2118.
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