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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


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]


Copyright Statement

© 2015. The American Astronomical Society

DOI: doi:10.1088/0004-637X/805/2/129


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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