Estimating the Kinematic Parameters and the Distance-Scale Zero Point for the Thin-Disk, Thick-Disk, and Halo Population Tracers via 3D Velocity Data

Details Estimating the Kinematic Parameters and the Distance-Scale Zero Point for the Thin-Disk, Thick-Disk, and Halo Population Tracers via 3D Velocity Data Estimating the Kinematic Parameters and the Distance-Scale Zero Point for the Thin-Disk, Thick-Disk, and Halo Population Tracers via 3D Velocity Data

2010-01-09

arxiv.org/abs/1001.1428v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

4 pages. To be published in the proceedings of the B.V. Kukarkin Centenary Conference "Variable stars, the Galactic halo and g

Scientific paper

We use the method of statistical parallax to constrain the distance-scale zero points and analyze the kinematics of extensive samples of Galactic classical Cepheids, RR Lyrae type variables, and blue horizontal branch stars, which serve as standard candles/kinematic tracers of various Galactic populations. We obtain three consistent estimates for the local circular velocity based on the mean velocities of halo RR Lyrae variables, BHB stars, and Galactic rotation curve inferred from Cepheid data with an average value of 210+/-6 km/s, which is close to the average circular velocity in the 5-40 kpc interval of Galactocentric distances inferred from BHB star data (195+/-5 km/s), thereby providing further supporting evidence for the practically flat shape of the Galactic rotation curve beyond ~5 kpc from the center. The inferred distance-scale corrections imply a solar Galactocentric distance of 7.7+/-0.4 kpc, an LMC distance modulus of 18.42+/-0.06, and a Hubble constant of 73-85 km/s/Mpc.

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