The Milky Way's Circular Velocity Curve and Its Constraint on the Galactic Mass with RR Lyrae Stars

doi:10.3847/1538-4357/aa83b2

	The Milky Way's Circular Velocity Curve and Its Constraint on the Galactic Mass with RR Lyrae Stars
	Zhao, Gang; Ablimit, Iminhaji
刊名	ASTROPHYSICAL JOURNAL
	2017-09-01
卷号	846 期号:1
关键词	Galaxy: General Galaxy: Halo Galaxy: Kinematics And Dynamics Stars: Variables: Rr Lyrae
DOI	10.3847/1538-4357/aa83b2
文献子类	Article
英文摘要	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.
WOS关键词	WAY HALO ; KINEMATICS ; GALAXY ; KPC ; DISTANCES ; PROFILE ; OBJECTS
WOS研究方向	Astronomy & Astrophysics
语种	英语
WOS记录号	WOS:000408362800010
资助机构	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)
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/20145]
专题	国家天文台_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
推荐引用方式 GB/T 7714	Zhao, Gang,Ablimit, Iminhaji. 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	Zhao, Gang,&Ablimit, Iminhaji.(2017).The Milky Way's Circular Velocity Curve and Its Constraint on the Galactic Mass with RR Lyrae Stars.ASTROPHYSICAL JOURNAL,846(1).
MLA	Zhao, Gang,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).