Nonlinearities in the motion of the Galactic masers

Authors

  • Vadim V. Bobylev St. Petersburg State University, Universitetskaya nab., 7-9, St. Petersburg, 199034, Russian Federation;

Abstract

Parameters of the Galactic rotation were estimated using sample of 114 Galactic masers with known trigonometric VLBI parallaxes. For adopted Solar galactocentric distance R0 = 8.3±0.2 kpc the values of the Oort constants are estimated as A = -16.51±0.34 km c^-1 kpc^-1 and B = 12.75±0.49 km c^-1 kpc^-1, linear velocity of the galactic rotation at the Solar distance is equal to V0 = 243 ± 6 km c^-1. Analysis of three-dimensional kinematics of these masers shows that in addition to derivatives of higher orders in the Galactic rotation curve, which manifest themselves in the xy-plane, the periodic perturbations in all three planes play a significant role, what is connected with the influence of the Galactic spiral density wave. Refs 22. Figs 5.

Keywords:

Galactic kinematics, masers

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Published

2015-08-01

How to Cite

Bobylev, V. V. (2015). Nonlinearities in the motion of the Galactic masers. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2(3), 443–452. Retrieved from https://math-mech-astr-journal.spbu.ru/article/view/11179

Issue

Vol. 2 No. 3 (2015)

Section

Astronomy

License

Articles of "Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy" are open access distributed under the terms of the License Agreement with Saint Petersburg State University, which permits to the authors unrestricted distribution and self-archiving free of charge.