Parameters of the Galactic Spiral Density Wave from Masers with Parallax Errors Less Than 10%

Abstract

We have studied the kinematics of Galactic masers and radio stars with measured VLBI trigonometric parallaxes and proper motions. We have considered masers with relative trigonometric parallax errors less than 10\% and determined the Galactic rotation parameters from them. In particular, the linear rotation velocity of the Galaxy at the solar distance $R_0$ has been found to be $244.4\pm 4.3$ km s${}^{-1}$ (for the adopted $R_0=8.1\pm 0.1$ kpc). We have performed a joint and separate spectral analysis of the radial, residual tangential, and vertical maser velocities. For example, from the vertical maser velocities we have estimated the velocity perturbation amplitude $f_W=5.2\pm 1.5$ km s${}^{-1}$ with the wavelength ${\lambda }_W=2.6\pm 0.7$ kpc, arguing for the influence of the spiral density wave on the vertical stellar velocities. Based on 104 masers within 3 kpc of the Sun, as a result of the joint solution, we have estimated the radial, $f_R=6.7\pm 1.1$ km s${}^{-1}$, and tangential, $f_{\theta }=2.6\pm 1.2$ km s${}^{-1}$, velocity perturbations, the perturbation wavelength $\lambda =2.1\pm 0.3$ kpc, and the Sun's phase in the Galactic spiral density wave ${\chi }_{\odot }=-148\pm 15^{\circ }$. We have confirmed the presence of the Radcliffe wave in the spatial distribution of masers and radio stars belonging to the Local Arm.

arXiv comment17 pages, 5 figures, 3 tables

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• Determination of the Spiral Pattern Speed in the Milky Way from Young Open Star Clusters
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• Determination of the Spiral Pattern Speed in the Galaxy from Three Samples of Stars
• Redetermination of the Parameters of the Galactic Spiral Pattern from Classical Cepheids