Study of the Galactic Rotation Based on Masers and Radio Stars with VLBI Measurements of Their Parallaxes

Abstract

Based on published data, we have produced a sample of 256 radio sources whose trigonometric parallaxes and proper motions were measured by VLBI. This sample contains Galactic masers associated with massive protostars and stars in active star-forming regions. It also includes young low-mass stars from the Gould Belt region whose radio observations were performed in continuum. Based on this, most complete sample of sources to date, we have estimated the velocities $(U,V,W{)}_{\odot }$ and the parameters of the angular velocity of Galactic rotation ${\Omega }_0,{\Omega }_0^{(1)},...,{\Omega }_0^{(4)}$ and obtained a new estimate of the distance fromthe Sun to the Galactic center, $R_0=8.15_{-0.20}^{+0.04}$ kpc. The parameters of the Galactic spiral density wave have been found from the series of radial, $V_R$, and residual tangential, $\Delta V_{circ}$, velocities of stars. The amplitudes of the radial and tangential velocity perturbations are $f_R=7.0\pm 0.9$ km s${}^{-1}$ and $f_{\theta }=3.8\pm 1.1$ km s${}^{-1}$, the perturbation wavelengths are ${\lambda }_R=2.3\pm 0.2$ kpc and ${\lambda }_{\theta }=2.0\pm 0.4$ kpc, and the Sun's phases in the spiral density wave are $({\chi }_{\odot }{)}_R=-163^{\circ }\pm 9^{\circ }$ and $({\chi }_{\odot }{)}_{\theta }=-137^{\circ }\pm 10^{\circ }$ for the adopted four-armed spiral pattern.

arXiv comment13 pages, 6 figures, 1 table. arXiv admin note: text overlap with arXiv:1903.09313, arXiv:1906.10151

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• The Milky Way Revealed by Variable Stars I: Sample Selection of RR Lyrae stars, and Evidence for the Merger History
• Parameters of the Galactic Spiral Density Wave from Masers with Parallax Errors Less Than 10%
• On the most reliable value of the Galactic aberration constant