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Anomalous peculiar motions of high-mass young stars in the Scutum spiral arm

Journal
Date Issued
2019
Author(s)
Immer, K.
•
Li, J.
•
Quiroga-Nuñez, L. H.
•
Reid, M. J.
•
Zhang, B.
•
•
DOI
Abstract
We present trigonometric parallax and proper motion measurements toward 22 GHz water and 6.7 GHz methanol masers in 16 high-mass star-forming regions. These sources are all located in the Scutum spiral arm of the Milky Way. The observations were conducted as part of the Bar and Spiral Structure Legacy (BeSSeL) survey. A combination of 14 sources from a forthcoming study and 14 sources from the literature, we now have a sample of 44 sources in the Scutum spiral arm, covering a Galactic longitude range from 0$^\circ$ to 33$^\circ$. A group of 16 sources shows large peculiar motions of which 13 are oriented toward the inner Galaxy. A likely explanation for these high peculiar motions is the combined gravitational potential of the spiral arm and the Galactic bar.
Volume
632
Start page
A123
Uri
Url
Issn Identifier
0004-6361
Ads BibCode
2019A&A...632A.123I
Rights
open.access
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