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.

17 pages, 5 figures, 3 tables

References in corpus (20)

• Trigonometric Parallaxes Of High-Mass Star Forming Regions: Our View Of The Milky Way
• Improved GRAVITY astrometric accuracy from modeling of optical aberrations
• A Galactic-scale gas wave in the Solar Neighborhood
• Bending and Breathing Modes of the Galactic Disk
• Mapping Spiral Structure on the far side of the Milky Way
• Mapping the Galactic disk with the LAMOST and Gaia Red clump sample. VI: An evidence for the long lived non-steady warp of non-gravitational scenarios
• Redetermination of Galactic Spiral Density Wave Parameters Based on Spectral Analysis of Maser Radial Velocities
• Vertical velocities from proper motions of red clump giants
• Anomalous peculiar motions of high-mass young stars in the Scutum spiral arm
• A New Estimate of the Best Value for the Solar Galactocentric Distance
• Periodic Pattern in the Residual-Velocity Field of OB Associations
• Radio Variability from a Quiescent Stellar Mass Black Hole Jet
• Non-circular Motions in the Outer Perseus Spiral Arm
• Detection of periodic variations in vertical velocities of Galactic masers
• SiO maser astrometry of the red transient V838 Monocerotis
• Vertical Structure and Kinematics of the Galactic Outer Disk
• Kinematics of OB Stars with Data from the LAMOST and Gaia Catalogues
• Study of the Galactic Rotation Based on Masers and Radio Stars with VLBI Measurements of Their Parallaxes
• Corrections for the Lutz-Kelker Bias for Galactic Masers
• Helioseismic Modeling of Background Flows

Cited by in corpus (2)

• Determination of the Spiral Pattern Speed in the Milky Way from Young Open Star Clusters
• Determination of the Spiral Pattern Speed in the Galaxy from Three Samples of Stars