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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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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 ? = 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.

Publication Date

  • 2017

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