Budanova N.O., Korchagin V.I. Kinematical Properties of the Thick Disk of Galaxy as Based on the Catalog by Breddles et al.

Budanova Natalya Olegovna
 
Junior Researcher, Research Institute of Physics of Southern Federal University
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Prosp. Stachki, 194, 344090 Rostov-on-Don, Russian Federation
 
Korchagin Vladimir Ivanovich
Doctor of Physical and Mathematical Sciences, Leading Researcher, Research Institute of Physics of Southern Federal University
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Prosp. Stachki, 194, 344090 Rostov-on-Don, Russian Federation
 
Abstract. The catalogs of stars’ radial velocities such as RAVE act as the source of unique data allowing to calculate the dynamics of the Galaxy in the past and in the present. On the basis of the kinematical catalog by Breddles et al. [4], containing the three-dimensional velocities of 16 146 nearby stars together with the distances, we selected samples of 451 stars that kinematically belong to the thick disk of the Galaxy. Using our samples we performed the analysis of the kinematical properties of the Galactic thick disk. The determined rotational velocity of the thick disk located near the Galactic mid-plane is about 200 km/s, and this value is consistent with the determinations of other authors [7; 21]. The components of the velocity dispersion of the thick disk R = 93,4 ± 15,2; σΘ = 68,1 ± 5,9; σZ = 54,8 ± 1,8 km/s) are larger, compared to other determinations. This fact may testify in favor of the presence of the dark matter in the Galactic thick disk.
 
Key words: thick disk, kinematics, rotational velocity, dispersion of velocities.

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Kinematical Properties of the Thick Disk of Galaxy as Based on the Catalog by Breddles et al. by Budanova N.O., Korchagin V.I. is licensed under a Creative Commons Attribution 4.0 International License.

Citation in English: Science Journal of Volgograd State University. Mathematics. Physics. №6 (25) 2014 pp. 18-28
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