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The Milky Way's Circular Velocity Curve and Its Constraint on the Galactic Mass with RR Lyrae Stars
Ablimit, Iminhaji; Zhao, Gang
2017-09-01
发表期刊ASTROPHYSICAL JOURNAL
卷号846期号:1
摘要We present a sample of 1148 ab-type RR Lyrae (RRLab) variables identified from Catalina Surveys Data Release 1, combined with SDSS DR8 and LAMOST DR4 spectral data. We first use a large sample of 860 Galactic halo RRLab stars and derive the circular velocity distributions for the stellar halo. With the precise distances and carefully determined radial velocities (the center-of-mass radial velocities) and by considering the pulsation of the RRLab stars in our sample, we can obtain a reliable and comparable stellar halo circular velocity curve. We follow two different prescriptions for the velocity anisotropy parameter beta in the Jeans equation to study the circular velocity curve and mass profile. Additionally, we test two different solar peculiar motions in our calculation. The best result we obtained with the adopted solar peculiar motion 1 of (U, V, W) = (11.1, 12, 7.2) km s(-1) is that the enclosed mass of the Milky Way within 50 kpc is (3.75 +/- 1.33). x. 10(11) M-circle dot based on beta = 0 and the circular velocity 180 +/- 31.92 (km s(-1)) at 50 kpc. This result is consistent with dynamical model results, and it is also comparable to the results of previous similar works.
文章类型Article
关键词Galaxy: General Galaxy: Halo Galaxy: Kinematics And Dynamics Stars: Variables: Rr Lyrae
WOS标题词Science & Technology ; Physical Sciences
资助者China Postdoctoral Science Foundation(2015LH0015) ; China Postdoctoral Science Foundation(2015LH0015) ; Natural Science Foundation of China(11390371 ; Natural Science Foundation of China(11390371 ; National Development and Reform Commission ; National Development and Reform Commission ; 11233004) ; 11233004) ; China Postdoctoral Science Foundation(2015LH0015) ; China Postdoctoral Science Foundation(2015LH0015) ; Natural Science Foundation of China(11390371 ; Natural Science Foundation of China(11390371 ; National Development and Reform Commission ; National Development and Reform Commission ; 11233004) ; 11233004)
DOI10.3847/1538-4357/aa83b2
关键词[WOS]WAY HALO ; KINEMATICS ; GALAXY ; KPC ; DISTANCES ; PROFILE ; OBJECTS
收录类别SCI
语种英语
资助者China Postdoctoral Science Foundation(2015LH0015) ; China Postdoctoral Science Foundation(2015LH0015) ; Natural Science Foundation of China(11390371 ; Natural Science Foundation of China(11390371 ; National Development and Reform Commission ; National Development and Reform Commission ; 11233004) ; 11233004) ; China Postdoctoral Science Foundation(2015LH0015) ; China Postdoctoral Science Foundation(2015LH0015) ; Natural Science Foundation of China(11390371 ; Natural Science Foundation of China(11390371 ; 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:000408362800010
引用统计
被引频次:6[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/20145
专题光学天文研究部
作者单位Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
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Ablimit, Iminhaji,Zhao, Gang. The Milky Way's Circular Velocity Curve and Its Constraint on the Galactic Mass with RR Lyrae Stars[J]. ASTROPHYSICAL JOURNAL,2017,846(1).
APA Ablimit, Iminhaji,&Zhao, Gang.(2017).The Milky Way's Circular Velocity Curve and Its Constraint on the Galactic Mass with RR Lyrae Stars.ASTROPHYSICAL JOURNAL,846(1).
MLA Ablimit, Iminhaji,et al."The Milky Way's Circular Velocity Curve and Its Constraint on the Galactic Mass with RR Lyrae Stars".ASTROPHYSICAL JOURNAL 846.1(2017).
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