NAOC Open IR  > 星系宇宙学研究部
Torus models of the outer disc of the Milky Way using LAMOST survey data
Wang, Qiao1; Wang, Yougang1; Liu, Chao2; Mao, Shude1,3,4; Long, R. J.4,5
2017-09-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume470Issue:3Pages:2949-2958
AbstractWith a sample of 48 161 K giant stars selected from the LAMOST DR 2 catalogue, we construct torus models in a large volume extending, for the first time, from the solar vicinity to a Galactocentric distance of similar to 20 kpc, reaching the outskirts of the Galactic disc. We show that the kinematics of the K giant stars match conventional models, e.g. as created by Binney in 2012, in the Solar vicinity. However such two-disc models fail if they are extended to the outer regions, even if an additional disc component is utilized. If we loosen constraints in Sun's vicinity, we find that an effective thick disc model could explain the anticentre of the MW. The Large Area Multi-Object Spectroscopic Telescope data imply that the sizes of the Galactic discs are much larger, and that the outer disc is much thicker, than previously thought, or alternatively that the outer structure is not a conventional disc at all. However, the velocity dispersion sigma(0z) of the kinematically thick disc in the best-fitting model is about 80 km s(-1) and has a scale parameter R-sigma for an exponential distribution function of similar to 19 kpc. Such a height sigma(0z) is strongly rejected by current measurements in the solar neighbourhood, and thus a model beyond quasi-thermal, two or three thin or thick discs is required.
SubtypeArticle
KeywordGalaxy: Disc Galaxy: Kinematics And Dynamics Galaxy: Structure Galaxies: Kinematics And Dynamics
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationNational Natural Science Foundation of China(11333003 ; National Natural Science Foundation of China(11333003 ; 973 Program(2014CB845700) ; 973 Program(2014CB845700) ; Strategic Priority Research Program 'The Emergence of Cosmological Structures' of the Chinese Academy of Sciences(XDB09000000) ; Strategic Priority Research Program 'The Emergence of Cosmological Structures' of the Chinese Academy of Sciences(XDB09000000) ; National Development and Reform Commission ; National Development and Reform Commission ; 11373032 ; 11373032 ; 11390372 ; 11390372 ; 11403035) ; 11403035) ; National Natural Science Foundation of China(11333003 ; National Natural Science Foundation of China(11333003 ; 973 Program(2014CB845700) ; 973 Program(2014CB845700) ; Strategic Priority Research Program 'The Emergence of Cosmological Structures' of the Chinese Academy of Sciences(XDB09000000) ; Strategic Priority Research Program 'The Emergence of Cosmological Structures' of the Chinese Academy of Sciences(XDB09000000) ; National Development and Reform Commission ; National Development and Reform Commission ; 11373032 ; 11373032 ; 11390372 ; 11390372 ; 11403035) ; 11403035)
DOI10.1093/mnras/stx1382
WOS KeywordRADIAL-VELOCITY ASSAY ; GALAXY DARK HALO ; SOLAR NEIGHBORHOOD ; STELLAR PARAMETERS ; GALACTIC DYNAMICS ; MASS-DISTRIBUTION ; ROTATION CURVE ; DATA RELEASE ; STARS ; KINEMATICS
Indexed BySCI
Language英语
Funding OrganizationNational Natural Science Foundation of China(11333003 ; National Natural Science Foundation of China(11333003 ; 973 Program(2014CB845700) ; 973 Program(2014CB845700) ; Strategic Priority Research Program 'The Emergence of Cosmological Structures' of the Chinese Academy of Sciences(XDB09000000) ; Strategic Priority Research Program 'The Emergence of Cosmological Structures' of the Chinese Academy of Sciences(XDB09000000) ; National Development and Reform Commission ; National Development and Reform Commission ; 11373032 ; 11373032 ; 11390372 ; 11390372 ; 11403035) ; 11403035) ; National Natural Science Foundation of China(11333003 ; National Natural Science Foundation of China(11333003 ; 973 Program(2014CB845700) ; 973 Program(2014CB845700) ; Strategic Priority Research Program 'The Emergence of Cosmological Structures' of the Chinese Academy of Sciences(XDB09000000) ; Strategic Priority Research Program 'The Emergence of Cosmological Structures' of the Chinese Academy of Sciences(XDB09000000) ; National Development and Reform Commission ; National Development and Reform Commission ; 11373032 ; 11373032 ; 11390372 ; 11390372 ; 11403035) ; 11403035)
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000406844800033
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/20063
Collection星系宇宙学研究部
Affiliation1.Chinese Acad Sci, Key Lab Computat Astrophys, Natl Astron Observ, Beijing 100012, Peoples R China
2.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China
3.Tsinghua Univ, Dept Phys, Ctr Astrophys, Beijing 100086, Peoples R China
4.Univ Manchester, Jodrell Bank, Ctr Astrophys, Sch Phys & Astron, Oxford Rd, Manchester M13 9PL, Lancs, England
5.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Wang, Qiao,Wang, Yougang,Liu, Chao,et al. Torus models of the outer disc of the Milky Way using LAMOST survey data[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,470(3):2949-2958.
APA Wang, Qiao,Wang, Yougang,Liu, Chao,Mao, Shude,&Long, R. J..(2017).Torus models of the outer disc of the Milky Way using LAMOST survey data.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,470(3),2949-2958.
MLA Wang, Qiao,et al."Torus models of the outer disc of the Milky Way using LAMOST survey data".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 470.3(2017):2949-2958.
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