Galactic Kinematics Derived from Data in the RAVE5, UCAC4, PPMXL, and Gaia TGAS Catalogs

TL;DR

This study analyzes stellar kinematics using data from Gaia TGAS, RAVE5, UCAC4, and PPMXL catalogs, deriving key Galactic parameters and comparing methods to improve velocity measurements accuracy.

Contribution

It provides new estimates of Galactic kinematic parameters and compares the consistency of proper motion and line-of-sight velocity data from multiple catalogs.

Findings

Galactic rotation parameters are stable across star ages.

Proper motions from different catalogs agree well on kinematic parameters.

Line-of-sight velocities can differ from proper motion results, but corrections improve consistency.

Abstract

The spatial velocities of the stars with high-precision positions, proper motions and parallaxes from the Gaia TGAS catalog and line-of-sight velocities from the RAVE5 catalog are considered. From the sample of 92395 stars with the age estimates we have obtained the following kinematic parameters: (U,V,W)=(9.42,20.34,7.21)+/-0.12,0.10,0.09) km/s, \Omega=26.29+/-0.39 km/s/kpc and \Omega'=-3.89+/-0.08 km/s/kpc^2, where V0=210+/-6 km/s (for adopted R0=8.0+/-0.2 kpc), and the Oort constants A=15.57+/-0.31 km/s/kpc and B=-10.72+/-0.50 km/s/kpc. It is shown that the parameters \Omega and \Omega' are stable to the star age. A comparative analysis of the Bottlinger model parameters obtained separately from the RAVE5 catalog line-of-sight velocities and the Gaia TGAS, UCAC4 and PPMXL catalogs proper motion has been made. It is shown that these parameters are in good agreement with each other when derived from the proper motions of both the terrestrial catalogs and catalog Gaia TGAS. At the same time, it was established that the values of the Bottlinger model parameters obtained from the line-of-sight velocities can differ from the corresponding parameters obtained from the proper motions. The reduction of the line-of-sight velocities from the RAVE5 catalog is proposed for eliminating these differences.