Trigonometric Parallaxes of Star-forming Regions beyond the Tangent Point of the Sagittarius Spiral Arm
文献类型：期刊论文
| 作者 | 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
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2019-03-20 |
| 卷号 | 874期号:1页码:13 |
| ISSN号 | 0004-637X |
| 关键词 | astrometry Galaxy: kinematics and dynamics Galaxy: structure masers stars: formation |
| DOI | 10.3847/1538-4357/ab001a |
| 通讯作者 | Wu, Y. W.() |
| 英文摘要 | As 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. |
| WOS关键词 | CLOUDS |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000462738400012 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/24195]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Wu, Y. W. |
| 作者单位 | 1.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 |
| 推荐引用方式 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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来源：紫金山天文台
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