PoS - Proceedings of Science
Volume 344 - 14th European VLBI Network Symposium & Users Meeting (EVN2018) - Astrometry Session
Where are you, Scutum? Tracking down a spiral arm with maser astrometry
K. Immer*, J. Li, L.H. Quiroga-Nuñez, M.J. Reid, B. Zhang and L. Moscadelli
Full text: pdf
Pre-published on: July 16, 2019
Published on: October 09, 2019
Abstract
In these proceedings, we discuss the parallax and proper motion measurements towards 43 high-mass star
forming regions in the Scutum spiral arm. These observations were conducted with the Very Long Baseline Array within
the framework of the Bar and Spiral Structure Legacy (BeSSeL) survey. The pitch angle of the spiral arm was found to be
18.6$^{\circ}$ $\pm$ 2.9$^{\circ}$, which is much larger than in other spiral arms.
In this arm, many sources have large peculiar motions, especially a group between $l$=29$^{\circ}$
and 32$^{\circ}$ which shows ordered motion > 25 km s$^{-1}$ towards the Galactic Center.
DOI: https://doi.org/10.22323/1.344.0055
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