The Spiral Pattern Speed in the Milky Way Galaxy

Abstract

For a sample of masers, the basic kinematic equations were solved by including the Galactic rotation parameters and the peculiar velocity of the Sun as the unknown variables. Based on spectral analysis, the following estimates were obtained: $|f{|}_{R,\theta }=(7.0,5.1)\pm (1.2,1.4)$ km s${}^{-1}$ and the corresponding wavelengths ${\lambda }_{R,\theta }=(1.9,1.7)\pm (0.4,0.7)$ kpc, as well as ${\chi }_{\odot }=-140^{\circ }\pm 15^{\circ }$. The presence of periodic perturbations in the vertical velocities of masers with an amplitude of $|f{|}_W=3.1\pm 1.4$ km s${}^{-1}$ and a wavelength of $\lambda =1.9\pm 0.8$ kpc was confirmed. It is shown that the velocities $f_R$ and $f_{\theta }$ can have both the same and different signs. Therefore, we obtained a large scatter of estimates. Thus, if $f_R$ and $f_{\theta }$ have the same signs, then ${\Omega }_p=25.8\pm 2.0$ km s${}^{-1}$ kpc${}^{-1}$ and $R_{cor}=9.1\pm 0.8$ kpc. And when $f_R$ and $f_{\theta }$ have different signs, then ${\Omega }_p=35.4\pm 2.0$ km s${}^{-1}$ kpc${}^{-1}$ and $R_{cor}=6.8\pm 0.8$ kpc.

13 pages, 3 figures, 1 table

References in corpus (31)

• The Galaxy in Context: Structural, Kinematic and Integrated Properties
• Trigonometric Parallaxes of High Mass Star Forming Regions: the Structure and Kinematics of the Milky Way
• Trigonometric Parallaxes Of High-Mass Star Forming Regions: Our View Of The Milky Way
• The observed spiral structure of the Milky Way
• Dawes Review 4: Spiral Structures in Disc Galaxies
• The Gould's Belt Distances Survey (GOBELINS). V. Distances and Kinematics of the Perseus molecular cloud
• Direct determination of the spiral pattern rotation speed of the Galaxy
• A New Model for the Spiral Structure of the Galaxy. Superposition of 2+4-armed patterns
• On the kinematic evolution of young local associations and the Sco-Cen complex
• On the Milky Way spiral arms from open clusters in Gaia EDR3
• Kinematics of young stars. II. Galactic spiral structure
• The spiral pattern rotation speed of the Galaxy and the corotation radius with GAIA DR2
• The Milky Way Spiral Structure Parameters from Data on Masers and Selected Open Clusters
• Galactic masers: kinematics, spiral structure and the disk dynamic state
• Recent advances in the determination of some Galactic constants in the Milky Way
• Pitch angle variations in spiral galaxies
• Classical Cepheids and the spiral structure of the Milky Way
• What Does the Milky Way Look Like?
• A new method for estimating the pattern speed of spiral structure in the Milky Way
• Redetermination of Galactic Spiral Density Wave Parameters Based on Spectral Analysis of Maser Radial Velocities
• The Radcliffe Wave is Oscillating
• A New Estimate of the Best Value for the Solar Galactocentric Distance
• Galactic Rotation Curve and Spiral Density Wave Parameters from 73 Masers
• Periodic Pattern in the Residual-Velocity Field of OB Associations
• Detection of periodic variations in vertical velocities of Galactic masers
• Radial migration in numerical simulations of Milky Way-sized galaxies
• Determination of the Spiral Pattern Speed in the Milky Way from Young Open Star Clusters
• Growing Local arm inferred by the breathing motion
• High Galactic latitude runaway stars as tracers of the spiral arms
• Determination of the Spiral Pattern Speed in the Galaxy from Three Samples of Stars
• The Expanding 3 kpc Arms Are Neither Expanding nor Spiral Arms but X1 Orbits Driven by the Galactic Bar