Parallaxes of 6.7-GHz Methanol Masers towards the G305.2 High-Mass Star Formation Region

Abstract

We have made measurements to determine the parallax and proper motion of the three 6.7-GHz methanol masers G305.200$+$0.019, G305.202$+$0.208 and G305.208$+$0.206. The combined parallax is found to be 0.25$\pm$0.05 mas, corresponding to a distance of 4.1${}_{-0.7}^{+1.2}$ kpc. This places the G305.2 star formation region in the Carina-Sagittarius spiral arm. The inclusion of G305.2 increases the Galactic azimuth range of the sources in this arm by 40${}^{\circ }$ from Sato et al., allowing us to determine the pitch angle of this spiral with greater confidence to be $\psi =19.0\pm 2.6^{\circ }$. The first VLBI 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 classII methanol masers in general.

12 pages, 6 figures and 8 tables

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