Galactic Rotation Parameters Based on Stars from Activ Star-Forming Regions with Data from the Gaia DR2 Catalogue

Abstract

We have studied a sample of more than 25 000 young stars with proper motions and trigonometric parallaxes from the Gaia DR2 catalogue. The relative errors of their parallaxes do not exceed 10\%. The selection of stars belonging to active star-forming regions was made by Marton et al. based on data from the Gaia DR2 catalogue by invoking infrared measurements from the WISE and Planck catalogues. Low-mass T Tauri stars constitute the majority of sample stars. The following parameters of the angular velocity of Galactic rotation have been found from them: ${\Omega }_0=28.40\pm 0.11$ km s${}^{-1}$ kpc${}^{-1}$, ${\Omega }_0^{{}^{\prime }}=-3.933\pm 0.033$ km s${}^{-1}$ kpc${}^{-2}$ and ${\Omega }_0^{{}^{\prime \prime }}=0.804\pm 0.040$ km s${}^{-1}$ kpc${}^{-3}$. The Oort constants are $A=15.73\pm 0.32$ km s${}^{-1}$ kpc${}^{-1}$ and $B=-12.67\pm 0.34$ km s${}^{-1}$ kpc${}^{-1}$, while the circular rotation velocity of the solar neighborhood around the Galactic center is $V_0=227\pm 4$ km s${}^{-1}$ for the adopted Galactocentric distance of the Sun $R_0=8.0\pm 0.15$ kpc.

12 pages, 4 figures, 4 tables

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