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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
Source PublicationASTROPHYSICAL JOURNAL
Volume846Issue:1
AbstractWe 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.
SubtypeArticle
KeywordGalaxy: General Galaxy: Halo Galaxy: Kinematics And Dynamics Stars: Variables: Rr Lyrae
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationChina 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
WOS KeywordWAY HALO ; KINEMATICS ; GALAXY ; KPC ; DISTANCES ; PROFILE ; OBJECTS
Indexed BySCI
Language英语
Funding OrganizationChina 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 Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000408362800010
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/20145
Collection光学天文研究部
AffiliationChinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
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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