Paper:	Maser Astrometry with VERA and the Galaxy's Structure
Volume:	476, New Trends in Radio Astronomy in the ALMA Era
Page:	81
Authors:	Honma, M.
Abstract:	We summarize the most up-dated results obtained with VERA (VLBI Exploration of Radio Astrometry). Since 2004, VERA has been conducting regular monitoring of Galactic maser sources, and parallaxes and proper motions have already been measured for ∼ 30 maser sources. By combining high-accuracy astrometry by VERA, VLBA and EVN, we have determined fundamental parameters of the Milky Way Galaxy. The Galaxy center distance is obtained to be R0 = 8.05 ± 0.45 kpc, being consistent with other recent determinations of R0. On the other hand, the Galactic rotation velocity at the Sun is found to be Θ0 = 238 ± 14 km s-1, indicating that the Galactic rotation and also the mass of the Galaxy need an upward modification.

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