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The Rotation Curve, Mass Distribution, and Dark Matter Content of the Milky Way from Classical Cepheids
Ablimit, Iminhaji1,2; Zhao, Gang1; Flynn, Chris3; Bird, Sarah A.1
2020-05-01
Source PublicationASTROPHYSICAL JOURNAL LETTERS
ISSN2041-8205
Volume895Issue:1Pages:8
AbstractWith the increasing number of large stellar survey projects, the quality and quantity of excellent tracers for studying the Milky Way are rapidly growing, one of which is the classical Cepheids. Classical Cepheids are high-precision standard candles with very low typical uncertainties (<3%) available via the mid-infrared period-luminosity relation. About 3500 classical Cepheids identified from the Optical Gravitational Lensing Experiment, All-Sky Automated Survey for Supernova, Gaia, Wide-field Infrared Survey Explorer, and Zwicky Transient Facility survey data have been analyzed in this work, and their spatial distributions show a clear signature of Galactic warp. Two kinematical methods are adopted to measure the Galactic rotation curve (RC) in the Galactocentric distance range of 4 less than or similar to R-GC less than or similar to 19 kpc. Gently declining RCs are derived by both the proper motion (PM) method and three-dimensional velocity vector (3DV) method. The largest sample of classical Cepheids with the most accurate 6D phase-space coordinates available to date are modeled in the 3DV method, and the resulting RC is found to decline at the relatively smaller gradient of (-1.33 +/- 0.1) km s(-1) kpc(-1). Comparing to results from the PM method, a higher rotation velocity ((232.5 +/- 0.83) km s(-1)) is derived at the position of the Sun in the 3DV method. The virial mass and local dark matter density are estimated from the 3DV method, which is the more reliable method, M-vir = (0.822 +/- 0.052) x 10(12) M-circle dot and rho(DM,circle dot) = 0.33 +/- 0.03 GeV, respectively.
KeywordDark matter density Galaxy mass distribution Milky Way dark matter halo Milky Way dynamics Cepheid variable stars Galaxy rotation curves Dark matter
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Development and Reform Commission ; National Development and Reform Commission
DOI10.3847/2041-8213/ab8d45
WOS KeywordTO-LIGHT RATIO ; RADIAL-VELOCITIES ; GALACTIC HALO ; RR LYRAE ; KINEMATICS ; GALAXY ; DISK ; DENSITY ; MODELS ; STARS
Language英语
Funding ProjectNational Natural Science Foundation of China[11988101] ; National Natural Science Foundation of China[11890694] ; National Key R&D Program of China[2019YFA0405502] ; National Aeronautics and Space Administration ; National Development and Reform Commission
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Development and Reform Commission ; National Development and Reform Commission
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000536868100001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/54863
Collection中国科学院国家天文台
Corresponding AuthorAblimit, Iminhaji
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
2.Kyoto Univ, Dept Astron, Sakyo Ku, Kitashirakawa Oiwake Cho, Kyoto 6068502, Japan
3.Swinburne Univ Technol, Ctr Astrophys & Supercomp, POB 218, Hawthorn, Vic 3122, Australia
Recommended Citation
GB/T 7714
Ablimit, Iminhaji,Zhao, Gang,Flynn, Chris,et al. The Rotation Curve, Mass Distribution, and Dark Matter Content of the Milky Way from Classical Cepheids[J]. ASTROPHYSICAL JOURNAL LETTERS,2020,895(1):8.
APA Ablimit, Iminhaji,Zhao, Gang,Flynn, Chris,&Bird, Sarah A..(2020).The Rotation Curve, Mass Distribution, and Dark Matter Content of the Milky Way from Classical Cepheids.ASTROPHYSICAL JOURNAL LETTERS,895(1),8.
MLA Ablimit, Iminhaji,et al."The Rotation Curve, Mass Distribution, and Dark Matter Content of the Milky Way from Classical Cepheids".ASTROPHYSICAL JOURNAL LETTERS 895.1(2020):8.
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