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The age-velocity dispersion relation of the Galactic discs from LAMOST-Gaia data
Yu, Jincheng; Liu, Chao
2018-03-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume475Issue:1Pages:1093-1103
AbstractWe present the age-velocity dispersion relation (AVR) in three dimensions in the solar neighbourhood using 3564 commonly observed sub-giant/red giant branch stars selected from The Large Sky Area Multi-Object Fiber Spectroscopic Telescope, which gives the age and radial velocity, and Gaia, which measures the distance and proper motion. The stars are separated into metal-poor ([Fe/H] < -0.2 dex and metal-rich ([Fe/H] > -0.2 dex) groups, so that the metal-rich stars are mostly alpha-poor, while the metal-poor group are mostly contributed by a-enhanced stars. Thus, the old and metal-poor stars likely belong to the chemically defined thick disc population, while the metal-rich sample is dominated by the thin disc. The AVR for the metal-poor sample shows an abrupt increase at greater than or similar to 7 Gyr, which is contributed by the thick disc component. On the other hand, most of the thin disc stars with [Fe/H] > -0.2 dex display a power-law-like AVR with indices of about 0.3-0.4 and 0.5 for the in-plane and vertical dispersions, respectively. This is consistent with the scenario that the disc is gradually heated by the spiral arms and/or the giant molecular clouds. Moreover, the older thin disc stars (> 7 Gyr) have a rounder velocity ellipsoid, i.e. sigma(phi)/sigma(z), is close to 1.0, probably due to the more efficient heating in vertical direction. Particularly for the old metal-poor sample located with vertical bar z vertical bar > 270 pc, the vertical dispersion is even larger than its azimuthal counterpart. Finally, the vertex deviations and the tilt angles are plausibly around zero with large uncertainties.
KeywordGalaxy: disc Galaxy: evolution Galaxy: kinematics and dynamics solar neighbourhood
Funding OrganizationNational Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Development and Reform Commission ; National Development and Reform Commission ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Development and Reform Commission ; National Development and Reform Commission ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Development and Reform Commission ; National Development and Reform Commission ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Development and Reform Commission ; National Development and Reform Commission
DOI10.1093/mnras/stx3204
WOS KeywordMILKY-WAY DISC ; GENEVA-COPENHAGEN SURVEY ; RADIAL MIGRATION ; DYNAMICAL EVOLUTION ; SOLAR NEIGHBORHOOD ; CHEMICAL EVOLUTION ; TELESCOPE LAMOST ; SPIRAL GALAXIES ; THICK DISCS ; KINEMATICS
Language英语
Funding ProjectNational Key Basic Research Program of China[2014CB845700] ; National Natural Science Foundation of China (NSFC)[11373032] ; National Natural Science Foundation of China (NSFC)[11333003] ; National Development and Reform Commission
Funding OrganizationNational Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Development and Reform Commission ; National Development and Reform Commission ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Development and Reform Commission ; National Development and Reform Commission ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Development and Reform Commission ; National Development and Reform Commission ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Development and Reform Commission ; National Development and Reform Commission
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000427144200084
PublisherOXFORD UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/37151
Collection中国科学院国家天文台
Corresponding AuthorYu, Jincheng; Liu, Chao
AffiliationChinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Yu, Jincheng,Liu, Chao. The age-velocity dispersion relation of the Galactic discs from LAMOST-Gaia data[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,475(1):1093-1103.
APA Yu, Jincheng,&Liu, Chao.(2018).The age-velocity dispersion relation of the Galactic discs from LAMOST-Gaia data.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,475(1),1093-1103.
MLA Yu, Jincheng,et al."The age-velocity dispersion relation of the Galactic discs from LAMOST-Gaia data".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 475.1(2018):1093-1103.
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