Milky Way thin and thick disk kinematics with GAIA EDR3 and RAVE DR5

Abstract

We present a detailed analysis of kinematics of the Milky Way disk in solar neighborhood using GAIA DR3 catalog. To determine the local kinematics of the stellar disks of the Milky Way galaxy we use a complete sample of 278,228 red giant branch (RGB) stars distributed in a cylinder, centered at the Sun with a 1 kpc radius and half-height of 0.5 kpc. We determine separately the kinematical properties of RGB stars for each Galactic hemisphere in search for possible asymmetries. The kinematical properties of the RGB stars reveal the existence of two kinematically distinct components: the thin disk with mean velocities $V_R,V_{\varphi },V_Z$ of about -1, -239, 0 km s${}^{-1}$ correspondingly and velocity dispersions ${\sigma }_R,{\sigma }_{\varphi },{\sigma }_Z$ of 31, 20 and 11 km s${}^{-1}$, and the Thick disk with mean velocities components of about +1, -225, 0 km s${}^{-1}$, and velocity dispersions of 49, 35, and 22 km s${}^{-1}$. We find that up to 500 pc height above/below the galactic plane, Thick disk stars comprise about half the stars of the disk. Such high amount of RGB stars with Thick disk kinematics points at the secular evolution scenario origin for the Thick disk of the Milky Way galaxy.

14 pages, 9 figures

References in corpus (10)

• The Gaia mission
• The Radial Velocity Experiment (RAVE): Fifth Data Release
• Riding the Spiral Waves: Implications of Stellar Migration for the Properties of Galactic Disks
• Completeness of the Gaia-verse II: what are the odds that a star is missing from Gaia DR2?
• The Milky Way as a High Redshift Galaxy: The Importance of Thick Disk Formation in Galaxies
• The stellar velocity distribution function in the Milky Way galaxy
• Milky Way's Thick and Thin disk: Is there distinct thick disk?
• The Photo-Astrometric Vertical Tracer Density of the Milky Way II: Results from Gaia
• The Photo-Astrometric Vertical Tracer Density of the Milky Way I: The Method
• A selection function toolbox for subsets of astronomical catalogues

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