Determination of Galactic Rotation Parameters and the Solar Galactocentric Distance Ro from 73 Masers

Abstract

We have determined the Galactic rotation parameters and the solar Galactocentric distance R_0 by simultaneously solving Bottlinger's kinematic equations using data on masers with known line-of-sight velocities and highly accurate trigonometric parallaxes and proper motions measured by VLBI. Our sample includes 73 masers spanning the range of Galactocentric distances from 3 to 14 kpc. The solutions found are Omega_0 = 28.86 +/- 0.45 km/s/kpc, Omega'_0 = -3.96 +/- 0.09 km/s/kpc^2, Omega"_0 =0.790 +/- 0.027 km/s/kpc^3, and R_0=8.3 +/- 0.2 kpc.In this case, the linear rotation velocity at the solar distance Ro is V_0=241 +/- 7 km/s. Note that we have obtained the Ro estimate, which is of greatest interest, from masers for the first time; it is in good agreement with the most recent estimates and even surpasses them in accuracy.

12 pages, 2 figures

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• The Galaxy Kinematics from OB Stars with Proper Motions from the Gaia DR1 Catalog
• The relation of the Alpha Persei star cluster with the nearby stellar stream
• Calibrating the BHB Star Distance Scale and the Halo Kinematic Distance to the Galactic Centre
• Galactic Kinematics from Data on Open Star Clusters from the MWSC Catalogue
• Analysis of Galactic Rotation from Masers based on a Nonlinear Oort Model
• Vertical Distribution and Kinematics of Protoplanetary Nebulae in the Galaxy
• Kinematics of Hot Subdwarfs from the Gaia DR2 Catalogue