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The Density Profile and Kinematics of the Milky Way with RR Lyrae Stars
Ablimit, Iminhaji1,2; Zhao, Gang1
2018-03-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume855Issue:2Pages:4
AbstractMost of the known RR Lyraes are type ab RR Lyraes (RRLab), and they are an excellent tool to map the Milky Way and its substructures. We find that 1148 RRLab stars determined by Drake et al. have been observed by spectroscopic surveys of SDSS and LAMOST. We derived the radial velocity dispersion, circular velocity, and mass profile from 860 halo tracers in Paper I. Here we present the stellar densities and radial velocity distributions of the thick disk and halo of the Milky Way. The 288 RRLab stars located in the thick disk have the mean metallicity of [Fe/H] = -1.02. Three thick disk tracers have a radial velocity lower than 215 km s(-1). With 860 halo tracers, which have a mean metallicity of [Fe/H] = -1.33, we find a double power law of n(r) proportional to r(-2.8) and n(r) proportional to r(-4.8) with a break distance of 21 kpc to express the halo stellar density profile. The radial velocity dispersion at 50 kpc is around 78 km s(-1).
KeywordGalaxy: disk Galaxy: general Galaxy: halo stars: variables: RR Lyrae
Funding OrganizationJSPS Postdoctoral fellowship of Japan ; JSPS KAKENHI ; National Natural Science Foundation of China ; National Development and Reform Commission ; JSPS Postdoctoral fellowship of Japan ; JSPS KAKENHI ; National Natural Science Foundation of China ; National Development and Reform Commission ; JSPS Postdoctoral fellowship of Japan ; JSPS KAKENHI ; National Natural Science Foundation of China ; National Development and Reform Commission ; JSPS Postdoctoral fellowship of Japan ; JSPS KAKENHI ; National Natural Science Foundation of China ; National Development and Reform Commission
DOI10.3847/1538-4357/aaac7f
WOS KeywordDIGITAL SKY SURVEY ; STELLAR HALO ; GALACTIC HALO ; STRIPE 82 ; LAMOST ; SUBSTRUCTURE ; GALAXY ; VIEW ; SDSS ; DISC
Language英语
Funding ProjectJSPS Postdoctoral fellowship of Japan[P17022] ; JSPS KAKENHI[17F17022] ; National Natural Science Foundation of China[11390371] ; National Natural Science Foundation of China[11233004] ; National Development and Reform Commission
Funding OrganizationJSPS Postdoctoral fellowship of Japan ; JSPS KAKENHI ; National Natural Science Foundation of China ; National Development and Reform Commission ; JSPS Postdoctoral fellowship of Japan ; JSPS KAKENHI ; National Natural Science Foundation of China ; National Development and Reform Commission ; JSPS Postdoctoral fellowship of Japan ; JSPS KAKENHI ; National Natural Science Foundation of China ; National Development and Reform Commission ; JSPS Postdoctoral fellowship of Japan ; JSPS KAKENHI ; National Natural Science Foundation of China ; National Development and Reform Commission
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000427634000004
PublisherIOP PUBLISHING LTD
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/35657
Collection中国科学院国家天文台
Corresponding AuthorAblimit, Iminhaji
Affiliation1.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China
2.Kyoto Univ, Dept Astron, Sakyo Ku, Kitashirakawa Oiwake Cho, Kyoto 6068502, Japan
Recommended Citation
GB/T 7714
Ablimit, Iminhaji,Zhao, Gang. The Density Profile and Kinematics of the Milky Way with RR Lyrae Stars[J]. ASTROPHYSICAL JOURNAL,2018,855(2):4.
APA Ablimit, Iminhaji,&Zhao, Gang.(2018).The Density Profile and Kinematics of the Milky Way with RR Lyrae Stars.ASTROPHYSICAL JOURNAL,855(2),4.
MLA Ablimit, Iminhaji,et al."The Density Profile and Kinematics of the Milky Way with RR Lyrae Stars".ASTROPHYSICAL JOURNAL 855.2(2018):4.
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