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Parallaxes of 6.7-GHz methanol masers towards the G 305.2 high-mass star formation region

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Krishnan, V, Ellingsen, SP ORCID: 0000-0002-1363-5457, Reid, MJ, Bignall, HE, McCallum, J ORCID: 0000-0002-0233-6937, Phillips, CJ, Reynolds, C and Stevens, J 2017 , 'Parallaxes of 6.7-GHz methanol masers towards the G 305.2 high-mass star formation region' , Monthly Notices of the Royal Astronomical Society, vol. 465, no. 1 , pp. 1095-1105 , doi: 10.1093/mnras/stw2850.

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Abstract

We 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.

Item Type: Article
Authors/Creators:Krishnan, V and Ellingsen, SP and Reid, MJ and Bignall, HE and McCallum, J and Phillips, CJ and Reynolds, C and Stevens, J
Keywords: masers, stars: formation, galaxy: structure
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Blackwell Publishing Ltd
ISSN: 0035-8711
DOI / ID Number: 10.1093/mnras/stw2850
Copyright Information:

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.

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