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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
journal contribution
posted on 2023-05-18, 10:26 authored by Krishnan, V, Simon EllingsenSimon Ellingsen, Reid, MJ, Brunthaler, A, Sanna, A, Jamie McCallumJamie McCallum, Reynolds, C, Bignall, HE, Phillips, CJ, Dodson, R, Rioja, M, Caswell, JL, Chen, X, Dawson, JR, Fujisawa, K, Goedhart, S, Green, JA, Hachisuka, K, Honma, M, Menten, K, Shen, ZQ, Voronkov, MA, Walsh, AJ, Xu, Y, Zhang, B, Zheng, XWWe 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.
History
Publication title
The Astrophysical JournalVolume
805Article number
129Number
129Pagination
1-12ISSN
0004-637XDepartment/School
School of Natural SciencesPublisher
Institute of Physics PublishingPlace of publication
1427 E 60Th St, Chicago, USA, Il, 60637-2954Rights statement
© 2015. The American Astronomical SocietyRepository Status
- Open