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TRIGONOMETRIC PARALLAXES OF HIGH MASS STAR FORMING REGIONS: THE STRUCTURE AND KINEMATICS OF THE MILKY WAY
Reid, M. J.1; Menten, K. M.2; Brunthaler, A.2; Zheng, X. W.3; Dame, T. M.1; Xu, Y.4; Wu, Y.2; Zhang, B.2; Sanna, A.2; Sato, M.2; Hachisuka, K.5; Choi, Y. K.2; Immer, K.2; Moscadelli, L.6; Rygl, K. L. J.7; Bartkiewicz, A.8
2014-03-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume783Issue:2Pages:0
AbstractOver 100 trigonometric parallaxes and proper motions for masers associated with young, high- mass stars have been measured with the Bar and Spiral Structure Legacy Survey, a Very Long Baseline Array key science project, the European VLBI Network, and the Japanese VLBI Exploration of Radio Astrometry project. These measurements provide strong evidence for the existence of spiral arms in the MilkyWay, accurately locating many arm segments and yielding spiral pitch angles ranging from about 7 degrees to 20 degrees. The widths of spiral arms increase with distance from the Galactic center. Fitting axially symmetric models of the MilkyWay with the three- dimensional position and velocity information and conservative priors for the solar and average source peculiar motions, we estimate the distance to the Galactic center, R-0, to be 8.34 +/- 0.16 kpc, a circular rotation speed at the Sun, Theta(0), to be 240 +/- 8 km s(-1), and a rotation curve that is nearly flat ( i. e., a slope of -0.2 +/- 0.4 km s(-1) kpc(-1)) between Galactocentric radii of approximate to 5 and 16 kpc. Assuming a " universal" spiral galaxy form for the rotation curve, we estimate the thin disk scale length to be 2.44 +/- 0.16 kpc. With this large data set, the parameters R-0 and Theta(0) are no longer highly correlated and are relatively insensitive to different forms of the rotation curve. If one adopts a theoretically motivated prior that high- mass star forming regions are in nearly circular Galactic orbits, we estimate a global solar motion component in the direction of Galactic rotation, V-circle dot = 14.6 +/- 5.0 km s(-1). While Theta(0) and V-circle dot are significantly correlated, the sum of these parameters is well constrained, Theta(0) + V circle dot = 255.2 +/- 5.1 km s(-1), as is the angular speed of the Sun in its orbit about the Galactic center, ( Theta(0) + V-circle dot)/R-0 = 30.57 +/- 0.43 km s(-1) kpc(-1). These parameters improve the accuracy of estimates of the accelerations of the Sun and the Hulse-Taylor binary pulsar in their Galactic orbits, significantly reducing the uncertainty in tests of gravitational radiation predicted by general relativity.
KeywordGalaxy: Fundamental Parameters Galaxy: Kinematics And Dynamics Galaxy: Structure Gravitational Waves Parallaxes Stars: Formation
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/783/2/130
WOS KeywordLOCAL STELLAR KINEMATICS ; PERSEUS SPIRAL ARM ; BASE-LINE ARRAY ; GALACTIC-CENTER ; ROTATION CURVE ; BLACK-HOLE ; FUNDAMENTAL PARAMETERS ; CIRCULAR-VELOCITY ; DENSITY PROFILE ; VERA ESTIMATION
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Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000335439900066
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/10717
Collection紫金山天文台青海观测站
Affiliation1.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
2.Max Planck Inst Radioastron, D-53121 Bonn, Germany
3.Nanjing Univ, Dept Astron, Nanjing 210093, Jiangsu, Peoples R China
4.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
5.Shanghai Astron Observ, Shanghai, Peoples R China
6.Arcetri Observ, Florence, Italy
7.European Space Agcy, Estec, NL-2200 AG Noordwijk, Netherlands
8.Nicholas Copernicus Univ, Ctr Astron, Fac Phys Astron & Informat, PL-87100 Torun, Poland
Recommended Citation
GB/T 7714
Reid, M. J.,Menten, K. M.,Brunthaler, A.,et al. TRIGONOMETRIC PARALLAXES OF HIGH MASS STAR FORMING REGIONS: THE STRUCTURE AND KINEMATICS OF THE MILKY WAY[J]. ASTROPHYSICAL JOURNAL,2014,783(2):0.
APA Reid, M. J..,Menten, K. M..,Brunthaler, A..,Zheng, X. W..,Dame, T. M..,...&Bartkiewicz, A..(2014).TRIGONOMETRIC PARALLAXES OF HIGH MASS STAR FORMING REGIONS: THE STRUCTURE AND KINEMATICS OF THE MILKY WAY.ASTROPHYSICAL JOURNAL,783(2),0.
MLA Reid, M. J.,et al."TRIGONOMETRIC PARALLAXES OF HIGH MASS STAR FORMING REGIONS: THE STRUCTURE AND KINEMATICS OF THE MILKY WAY".ASTROPHYSICAL JOURNAL 783.2(2014):0.
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