Trigonometric Parallaxes of Star-forming Regions beyond the Tangent Point of the Sagittarius Spiral Arm

doi:10.3847/1538-4357/ab001a

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	Trigonometric Parallaxes of Star-forming Regions beyond the Tangent Point of the Sagittarius Spiral Arm
	Wu, Y. W.4,5; Reid, M. J.3; Sakai, N.4; Dame, T. M.3; Menten, K. M.2; Brunthaler, A.2; Xu, Y.1; Li, J. J.1; Ho, B.1; Zhang, B.7
刊名	ASTROPHYSICAL JOURNAL
	2019-03-20
卷号	874 期号:1 页码:13
关键词	astrometry Galaxy: kinematics and dynamics Galaxy: structure masers stars: formation
ISSN号	0004-637X
DOI	10.3847/1538-4357/ab001a
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.
资助项目	Chinese NSF through grants NSF[11673066] ; Chinese NSF through grants NSF[11673051] ; Chinese NSF through grants NSF[11873019] ; 100 Talents Project of the Chinese Academy of Sciences (CAS) ; Italian Ministero dell'Istruzione Universita e Ricerca through the grant Progetti Premiali 2012-iALMA[CUP C52I13000140001] ; West Light Foundation of the Chinese Academy of Sciences[XAB2016A06]
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000462738400012
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/31839]
专题	中国科学院上海天文台
通讯作者	Wu, Y. W.
作者单位	1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China 2.Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany 3.Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA 4.Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan 5.Chinese Acad Sci, Natl Time Serv Ctr, Key Lab Precise Positioning & Timing Technol, Xian 710600, Shaanxi, Peoples R China 6.INAF Ist Radioastron, Italian ALMA Reg Ctr, Via P Gobetti 101, I-40129 Bologna, Italy 7.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 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.