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Parallaxes of 6.7-GHz methanol masers towards the G 305.2 high-mass star formation region
journal contribution
posted on 2023-05-19, 01:11 authored by Krishnan, V, Simon EllingsenSimon Ellingsen, Reid, MJ, Bignall, HE, Jamie McCallumJamie McCallum, Phillips, CJ, Reynolds, C, Stevens, JWe have made measurements to determine the parallax and proper motion of the three 6.7-GHz methanol masers G 305.200+0.019, G 305.202+0.208 and G 305.208+0.206. The combined parallax is found to be 0.25±0.05 mas, corresponding to a distance of 4.1^{+1.2}_{-0.7} kpc. This places the G 305.2 star formation region in the Carina-Sagittarius spiral arm. The inclusion of G 305.2 increases the Galactic azimuth range of the sources in this arm by 40° from Sato et al., allowing us to determine the pitch angle of this spiral with greater confidence to be ψ = 19.0° ± 2.6°. The first very long baseline interferometry spot maps of the 6.7-GHz methanol masers towards these sources show that they have simple linear and ring-like structures, consistent with emission expected from class II methanol masers in general.
History
Publication title
Monthly Notices of the Royal Astronomical SocietyVolume
465Pagination
1095-1105ISSN
0035-8711Department/School
School of Natural SciencesPublisher
Blackwell Publishing LtdPlace of publication
9600 Garsington Rd, Oxford, England, Oxon, Ox4 2DgRights statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society Copyright 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.Repository Status
- Open