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Trigonometric Parallaxes of Star-forming Regions beyond the Tangent Point of the Sagittarius Spiral Arm
Wu, Y. W.1,2; Reid, M. J.3; Sakai, N.2; Dame, T. M.3; Menten, K. M.4; Brunthaler, A.4; Xu, Y.5; Li, J. J.5; Ho, B.5; Zhang, B.6; Rygl, K. L. J.7; Zheng, X. W.8
2019-03-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume874Issue:1Pages:13
Corresponding AuthorWu, Y. W.()
AbstractAs part of the BeSSeL Survey, we report trigonometric parallaxes and proper motions of molecular maser sources associated with 13 distant high-mass star-forming regions in the Sagittarius spiral arm of the Milky Way. In particular, we obtain improved parallax distance estimates for three well-studied regions: 1.9(-0.1)(+0.1) kpc for M17, 5.3(-0.9)(+1.3) kpc for W51, and 7.9(-0.7)(+0.9) kpc for GAL 045.5+00.0. Peculiar motions for all but one source are less than 20 km s(-1). We fit a log-periodic spiral to the locations and estimate an average pitch angle of 7 degrees.2 +/- 1 degrees.9. We find that the section of the arm beyond the tangent point in the first quadrant of the Milky Way appears 15 pc below the IAU-defined Galactic plane.
Keywordastrometry Galaxy: kinematics and dynamics Galaxy: structure masers stars: formation
DOI10.3847/1538-4357/ab001a
WOS KeywordCLOUDS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000462738400012
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/24196
Collection中国科学院紫金山天文台
Corresponding AuthorWu, Y. W.
Affiliation1.Chinese Acad Sci, Natl Time Serv Ctr, Key Lab Precise Positioning & Timing Technol, Xian 710600, Shaanxi, Peoples R China
2.Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan
3.Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA
4.Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany
5.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
6.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
7.INAF Ist Radioastron, Italian ALMA Reg Ctr, Via P Gobetti 101, I-40129 Bologna, Italy
8.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Wu, Y. W.,Reid, M. J.,Sakai, N.,et al. Trigonometric Parallaxes of Star-forming Regions beyond the Tangent Point of the Sagittarius Spiral Arm[J]. ASTROPHYSICAL JOURNAL,2019,874(1):13.
APA Wu, Y. W..,Reid, M. J..,Sakai, N..,Dame, T. M..,Menten, K. M..,...&Zheng, X. W..(2019).Trigonometric Parallaxes of Star-forming Regions beyond the Tangent Point of the Sagittarius Spiral Arm.ASTROPHYSICAL JOURNAL,874(1),13.
MLA Wu, Y. W.,et al."Trigonometric Parallaxes of Star-forming Regions beyond the Tangent Point of the Sagittarius Spiral Arm".ASTROPHYSICAL JOURNAL 874.1(2019):13.
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