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The Milky Way's rotation curve out to 100 kpc and its constraint on the Galactic mass distribution
Huang, Y.1; Liu, X. -W.1,2; Yuan, H. -B.3; Xiang, M. -S.4; Zhang, H. -W.1,2; Chen, B. -Q.1; Ren, J. -J.1; Wang, C.1; Zhang, Y.5; Hou, Y. -H.5; Wang, Y. -F.5; Cao, Z. -H.4
2016-12-01
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷号463期号:3页码:2623-2639
摘要The rotation curve (RC) of the Milky Way out to similar to 100 kpc has been constructed using similar to 16 000 primary red clump giants (PRCGs) in the outer disc selected from the LAMOST Spectroscopic Survey of the Galactic Anti-centre (LSS-GAC) and the Sloan Digital Sky Survey (SDSS)-III/APOGEE survey, combined with similar to 5700 halo K giants (HKGs) selected from the SDSS/SEGUE survey. To derive the RC, the PRCG sample of the warm disc population and the HKG sample of halo stellar population are, respectively, analysed using a kinematical model allowing for the asymmetric drift corrections and re-analysed using the spherical Jeans equation along with measurements of the anisotropic parameter beta currently available. The typical uncertainties of RC derived from the PRCG and HKG samples are, respectively, 5-7 km s(-1) and several tens km s(-1). We determine a circular velocity at the solar position, V-c(R-0) = 240 +/- 6 km s(-1) and an azimuthal peculiar speed of the Sun, V-circle dot = 12.1 +/- 7.6 km s(-1), both in good agreement with the previous determinations. The newly constructed RC has a generally flat value of 240 km s(-1) within a Galactocentric distance r of 25 kpc and then decreases steadily to 150 km s(-1) at r similar to 100 kpc. On top of this overall trend, the RC exhibits two prominent localized dips, one at r similar to 11 kpc and another at r similar to 19 kpc. From the newly constructed RC, combined with other constraints, we have built a parametrized mass model for the Galaxy, yielding a virialmass of the Milky Way's dark matter halo of 0.90(-0.08)(+0.07) x 10(12) M-circle dot and a local dark matter density, rho(circle dot, dm) = 0.32(-0.02)(+0.02) GeV cm(-3).
文章类型Article
关键词Galaxy: Disc Galaxy: Fundamental Parameters Galaxy: Halo Galaxy: Kinematics And Dynamics Galaxy: Structure
WOS标题词Science & Technology ; Physical Sciences
资助者National Key Basic Research Program of China(2014CB845700) ; National Key Basic Research Program of China(2014CB845700) ; National Natural Science Foundation of China(11473001 ; National Natural Science Foundation of China(11473001 ; National Development and Reform Commission ; National Development and Reform Commission ; 11233004) ; 11233004) ; National Key Basic Research Program of China(2014CB845700) ; National Key Basic Research Program of China(2014CB845700) ; National Natural Science Foundation of China(11473001 ; National Natural Science Foundation of China(11473001 ; National Development and Reform Commission ; National Development and Reform Commission ; 11233004) ; 11233004)
DOI10.1093/mnras/stw2096
关键词[WOS]DARK-MATTER DENSITY ; WAY STELLAR HALO ; VELOCITY DISPERSION PROFILE ; HORIZONTAL-BRANCH STARS ; DIGITAL SKY SURVEY ; RED CLUMP STARS ; SDSS-III ; SPECTROSCOPIC SURVEY ; OPEN CLUSTERS ; EVOLUTION EXPERIMENT
收录类别SCI
语种英语
资助者National Key Basic Research Program of China(2014CB845700) ; National Key Basic Research Program of China(2014CB845700) ; National Natural Science Foundation of China(11473001 ; National Natural Science Foundation of China(11473001 ; National Development and Reform Commission ; National Development and Reform Commission ; 11233004) ; 11233004) ; National Key Basic Research Program of China(2014CB845700) ; National Key Basic Research Program of China(2014CB845700) ; National Natural Science Foundation of China(11473001 ; National Natural Science Foundation of China(11473001 ; National Development and Reform Commission ; National Development and Reform Commission ; 11233004) ; 11233004)
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000393566000027
引用统计
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8296
专题太阳物理研究部
作者单位1.Peking Univ, Dept Astron, Beijing 100871, Peoples R China
2.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
3.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
4.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China
5.Chinese Acad Sci, Nanjing Inst Astron Opt & Technol, Natl Astron Observ, Nanjing 210042, Jiangsu, Peoples R China
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Huang, Y.,Liu, X. -W.,Yuan, H. -B.,et al. The Milky Way's rotation curve out to 100 kpc and its constraint on the Galactic mass distribution[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,463(3):2623-2639.
APA Huang, Y..,Liu, X. -W..,Yuan, H. -B..,Xiang, M. -S..,Zhang, H. -W..,...&Cao, Z. -H..(2016).The Milky Way's rotation curve out to 100 kpc and its constraint on the Galactic mass distribution.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,463(3),2623-2639.
MLA Huang, Y.,et al."The Milky Way's rotation curve out to 100 kpc and its constraint on the Galactic mass distribution".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 463.3(2016):2623-2639.
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