Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/30411
Title: | Trigonometric Parallaxes of Star-forming Regions beyond the Tangent Point of the Sagittarius Spiral Arm | 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, Kazi Lucie Jessica Zheng, X. W. |
Issue Date: | 2019 | Journal: | THE ASTROPHYSICAL JOURNAL | Number: | 874 | Issue: | 1 | First Page: | 94 | 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: {1.9}<SUB>-0.1</SUB><SUP>+0.1</SUP> {kpc} for M17, {5.3}<SUB>-0.9</SUB><SUP>+1.3</SUP> {kpc} for W51, and {7.9}<SUB>-0.7</SUB><SUP>+0.9</SUP> {kpc} for GAL 045.5+00.0. Peculiar motions for all but one source are less than 20 km s<SUP>-1</SUP>. 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. | URI: | http://hdl.handle.net/20.500.12386/30411 | URL: | https://iopscience.iop.org/article/10.3847/1538-4357/ab001a | ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/ab001a | Bibcode ADS: | 2019ApJ...874...94W | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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Wu_2019_ApJ_874_94.pdf | Pdf editoriale | 5.45 MB | Adobe PDF | View/Open |
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