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.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
刊名	The Astrophysical Journal
	2019-03-27
卷号	874 期号:1
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	Abstract 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: for M17, for W51, and 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.°2?±?1.°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.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-874-1-AB001A
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/31877]
专题	中国科学院上海天文台
作者单位	1.National Time Service Center, Key Laboratory of Precise Positioning and Timing Technology, Chinese Academy of Sciences, Xi’an 710600, People’s Republic of China 2.National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan 3.Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA 4.Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany 5.Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, People’s Republic of China 6.Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, People’s Republic of China 7.Italian ALMA Regional Centre, INAF—Istituto di Radioastronomia, Via P. Gobetti 101, I-40129 Bologna, Italy 8.School of Astronomy and Space Sciences of Nanjing University, Nanjing 210093, People’s Republic of 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]. The Astrophysical Journal,2019,874(1).
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.The Astrophysical Journal,874(1).
MLA	Wu,Y. W.,et al."Trigonometric Parallaxes of Star-forming Regions beyond the Tangent Point of the Sagittarius Spiral Arm".The Astrophysical Journal 874.1(2019).