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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

文献类型：期刊论文

作者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
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期2020
卷号491期号:2页码:2104-2118
ISSN号0035-8711
关键词Galaxy: disc Galaxy: kinematics and dynamics Galaxy: structure
DOI10.1093/mnras/stz3113
英文摘要We 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.
WOS关键词GIANT BRANCH STARS ; MILKY-WAY DISC ; VELOCITY DISTRIBUTION ; SOLAR NEIGHBORHOOD ; ANGULAR-MOMENTUM ; MINOR MERGERS ; PATTERN SPEED ; SPIRAL ARMS ; LOCAL DISC ; STELLAR
资助项目National Key Basic Research Program of China[SQ2019YFA040021] ; China Postdoctoral Science Foundation[2019M653504] ; Yunnan province postdoctoral Directed culture fundation ; Spanish Ministry of Economy and Competitiveness (MINECO)[PGC-2018-102249-B100] ; U.S. National Science Foundation[AST-1816196] ; National Natural Science Foundation of China[U1531244] ; National Natural Science Foundation of China[11833006] ; National Natural Science Foundation of China[11811530289] ; National Natural Science Foundation of China[U1731108] ; National Natural Science Foundation of China[11803029] ; National Natural Science Foundation of China[11903027] ; Yunnan University[C176220100006] ; Yunnan University[C176220100007] ; National Development and Reform Commission ; Special Funding for Advanced Users ; Cultivation Project for LAMOST Scientific Payoff and Research Achievement of CAMS-CAS ; LAMOST Fellow project
WOS研究方向Astronomy & Astrophysics
语种英语
出版者OXFORD UNIV PRESS
WOS记录号WOS:000512302100043
资助机构National Key Basic Research Program of China ; National Key Basic Research Program of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; Yunnan province postdoctoral Directed culture fundation ; Yunnan province postdoctoral Directed culture fundation ; Spanish Ministry of Economy and Competitiveness (MINECO) ; Spanish Ministry of Economy and Competitiveness (MINECO) ; U.S. National Science Foundation ; U.S. National Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Yunnan University ; Yunnan University ; National Development and Reform Commission ; National Development and Reform Commission ; Special Funding for Advanced Users ; Special Funding for Advanced Users ; Cultivation Project for LAMOST Scientific Payoff and Research Achievement of CAMS-CAS ; Cultivation Project for LAMOST Scientific Payoff and Research Achievement of CAMS-CAS ; LAMOST Fellow project ; LAMOST Fellow project ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; Yunnan province postdoctoral Directed culture fundation ; Yunnan province postdoctoral Directed culture fundation ; Spanish Ministry of Economy and Competitiveness (MINECO) ; Spanish Ministry of Economy and Competitiveness (MINECO) ; U.S. National Science Foundation ; U.S. National Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Yunnan University ; Yunnan University ; National Development and Reform Commission ; National Development and Reform Commission ; Special Funding for Advanced Users ; Special Funding for Advanced Users ; Cultivation Project for LAMOST Scientific Payoff and Research Achievement of CAMS-CAS ; Cultivation Project for LAMOST Scientific Payoff and Research Achievement of CAMS-CAS ; LAMOST Fellow project ; LAMOST Fellow project ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; Yunnan province postdoctoral Directed culture fundation ; Yunnan province postdoctoral Directed culture fundation ; Spanish Ministry of Economy and Competitiveness (MINECO) ; Spanish Ministry of Economy and Competitiveness (MINECO) ; U.S. National Science Foundation ; U.S. National Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Yunnan University ; Yunnan University ; National Development and Reform Commission ; National Development and Reform Commission ; Special Funding for Advanced Users ; Special Funding for Advanced Users ; Cultivation Project for LAMOST Scientific Payoff and Research Achievement of CAMS-CAS ; Cultivation Project for LAMOST Scientific Payoff and Research Achievement of CAMS-CAS ; LAMOST Fellow project ; LAMOST Fellow project ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; Yunnan province postdoctoral Directed culture fundation ; Yunnan province postdoctoral Directed culture fundation ; Spanish Ministry of Economy and Competitiveness (MINECO) ; Spanish Ministry of Economy and Competitiveness (MINECO) ; U.S. National Science Foundation ; U.S. National Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Yunnan University ; Yunnan University ; National Development and Reform Commission ; National Development and Reform Commission ; Special Funding for Advanced Users ; Special Funding for Advanced Users ; Cultivation Project for LAMOST Scientific Payoff and Research Achievement of CAMS-CAS ; Cultivation Project for LAMOST Scientific Payoff and Research Achievement of CAMS-CAS ; LAMOST Fellow project ; LAMOST Fellow project
源URL[http://ir.bao.ac.cn/handle/114a11/54254]  
专题中国科学院国家天文台
通讯作者Wang, H-F
作者单位1.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
推荐引用方式
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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