Determination of the Solar Galactocentric distance from masers kinemics
arXiv:1411.3548 · doi:10.1515/astro-2017-0201
Abstract
We have determined the Galactic rotation parameters and the solar Galactocentric distance 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 93 masers spanning the range of Galactocentric distances R from 3 to 15 kpc. The solutions found are Ω_0 = 29.7+/-0.5 km s^{-1} kpc^{-1}, Ω'_0 = -4.20+/-0.11 km s^{-1} kpc^{-2}, Ω"_0 =0.730+/-0.029 km s^{-1} kpc^{-3}, and R_0=8.03+/-0.12 kpc. In this case, the linear rotation velocity at the solar distance R_0 is V_0=238+/-6 km s^{-1}.
8 pages, 2 figures, 1 table. Paper was presented at the Conference "Modern Stellar Astronomy-2014" held in Rostov-on-Don State University on May 28-30, 2014, accepted for pubication in Baltic Astronomy
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