Journal
ASTRONOMY & ASTROPHYSICS
Volume 490, Issue 2, Pages 787-792Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:200810470
Keywords
stars: formation; ISM: molecules; instrumentation: high angular resolution; astrometry; masers
Categories
Funding
- Polish MNiI [1P03D02729]
- DFG Priority Programme 1177
Ask authors/readers for more resources
Context. Methanol masers are associated with young high-mass stars and are an important tool for investigating the process of massive star formation. Aims. The recently discovered methanol maser ring in G23.657-00.127 provides an excellent laboratory for a detailed study of the nature and physical origin of methanol maser emission, as well as parallax and proper motion measurements. Methods. Multi-epoch observations of the 12.2 GHz methanol maser line from the ring were conducted using the Very Long Baseline Array. Interferometric observations with milliarcsecond resolution enabled us to track single maser spots in great detail over a period of 2 years. Results. We have determined the trigonometric parallax of G23.657-00.127 to be 0.313 +/- 0.039 mas, giving a distance of 3.19(-0.35)(+0.46) kpc. The proper motion of the source indicates that it is moving with the same circular velocity as the LSR, but it shows a large peculiar motion of approximate to 35 km s(-1) toward the Galactic center.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available