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First parallax measurements toward a 6.7 GHz methanol maser with the Australian Long Baseline Array—distance to G 339.884-1.259
Citation
Krishnan, V and Ellingsen, SP and Reid, MJ and Brunthaler, A and Sanna, A and McCallum, J and Reynolds, C and Bignall, HE and Phillips, CJ and Dodson, R and Rioja, M and Caswell, JL and Chen, X and Dawson, JR and Fujisawa, K and Goedhart, S and Green, JA and Hachisuka, K and Honma, M and Menten, K and Shen, ZQ and Voronkov, MA and Walsh, AJ and Xu, Y and Zhang, B and Zheng, XW, First parallax measurements toward a 6.7 GHz methanol maser with the Australian Long Baseline Array distance to G 339.884-1.259, The Astrophysical Journal, 805, (2) Article 129. ISSN 0004-637X (2015) [Refereed Article]
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Copyright Statement
© 2015. The American Astronomical Society
DOI: doi:10.1088/0004-637X/805/2/129
Abstract
We have conducted the first parallax and proper motion measurements of 6.7 GHz methanol maser emission using
the Australian Long Baseline Array. The parallax of G 339.884–1.259 measured from five epochs of observations
is 0.48 ± 0.08 mas, corresponding to a distance of -
2.1+0.4
-0.3 kpc, placing it in the Scutum spiral arm. This is
consistent (within the combined uncertainty) with the kinematic distance estimate for this source at 2.5 ± 0.5 kpc
using the latest Solar and Galactic rotation parameters. We find from the Lyman continuum photon flux that the
embedded core of the young star is of spectral type B1, demonstrating that luminous 6.7 GHz methanol masers can
be associated with high-mass stars toward the lower end of the mass range.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | astrometry, galaxy: kinematics and dynamics, masers, stars: formation |
| Research Division: | Physical Sciences |
| Research Group: | Astronomical sciences |
| Research Field: | Galactic astronomy |
| Objective Division: | Expanding Knowledge |
| Objective Group: | Expanding knowledge |
| Objective Field: | Expanding knowledge in the physical sciences |
| UTAS Author: | Krishnan, V (Mr Vasaant Krishnan) |
| UTAS Author: | Ellingsen, SP (Professor Simon Ellingsen) |
| UTAS Author: | McCallum, J (Dr Jamie McCallum) |
| ID Code: | 100827 |
| Year Published: | 2015 |
| Web of Science® Times Cited: | 25 |
| Deposited By: | Mathematics and Physics |
| Deposited On: | 2015-06-01 |
| Last Modified: | 2017-11-06 |
| Downloads: | 411 View Download Statistics |
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