Torus models of the outer disc of the Milky Way using LAMOST survey data

doi:10.1093/mnras/stx1382

	Torus models of the outer disc of the Milky Way using LAMOST survey data
	Liu, Chao1 ; Long, R. J.3,4; Mao, Shude2,4,5 ; Wang, Qiao2 ; Wang, Yougang2
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2017-09-01
卷号	470 期号:3 页码:2949-2958
关键词	Galaxy: Disc Galaxy: Kinematics And Dynamics Galaxy: Structure Galaxies: Kinematics And Dynamics
DOI	10.1093/mnras/stx1382
文献子类	Article
英文摘要	With 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.
WOS关键词	RADIAL-VELOCITY ASSAY ; GALAXY DARK HALO ; SOLAR NEIGHBORHOOD ; STELLAR PARAMETERS ; GALACTIC DYNAMICS ; MASS-DISTRIBUTION ; ROTATION CURVE ; DATA RELEASE ; STARS ; KINEMATICS
WOS研究方向	Astronomy & Astrophysics
语种	英语
WOS记录号	WOS:000406844800033
资助机构	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) ; 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)
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/20063]
专题	国家天文台_星系宇宙学研究部
作者单位	1.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China 2.Chinese Acad Sci, Key Lab Computat Astrophys, Natl Astron Observ, Beijing 100012, Peoples R China 3.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 4.Univ Manchester, Jodrell Bank, Ctr Astrophys, Sch Phys & Astron, Oxford Rd, Manchester M13 9PL, Lancs, England 5.Tsinghua Univ, Dept Phys, Ctr Astrophys, Beijing 100086, Peoples R China
推荐引用方式 GB/T 7714	Liu, Chao,Long, R. J.,Mao, Shude,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	Liu, Chao,Long, R. J.,Mao, Shude,Wang, Qiao,&Wang, Yougang.(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	Liu, Chao,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.