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

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-studie...

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Bibliographic Details
Published inThe Astrophysical journal Vol. 874; no. 1; pp. 94 - 106
Main Authors Wu, Y. W., Reid, M. J., Sakai, N., Dame, T. M., Menten, K. M., Brunthaler, A., Xu, Y., Li, J. J., Ho, B., Zhang, B., Rygl, K. L. J., Zheng, X. W.
Format Journal Article
LanguageEnglish
Published Philadelphia The American Astronomical Society 20.03.2019
IOP Publishing
Subjects
astrometry
Astrophysics
Galaxy: kinematics and dynamics
Galaxy: structure
masers
Massive stars
Milky Way
Parallax
Pitch (inclination)
Star formation
Stars & galaxies
stars: formation
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Summary: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.
Bibliography:AAS12833
Stars and Stellar Physics
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ab001a