Galactic Orbits of Globular Clusters in the Region of the Galactic Bulge

Abstract

Galactic orbits have been constructed over long time intervals for ten globular clusters located near the Galactic center. A model with an axially symmetric gravitational potential for the Galaxy was initially applied, after which a non-axially symmetric potential corresponding to the central bar was added. Variations in the trajectories of all these globular clusters in the XY plane due to the influence of the bar were detected. These were greatest for the cluster Terzan 4 in the meridional (RZ) plane. The globular clusters Terzan 1, Terzan 2, Terzan 4, Terzan 9, NGC 6522, and NGC 6558 always remained within the Galactic bulge, no farther than 4 kpc from the Galactic center.

11 pages, 5 tables, 2 figures

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• The Chemical Composition of Globular Clusters of Different Nature in our Galaxy
• Globular Clusters of the Galaxy: Chemical Composition vs Kinematics
• Signatures of the Galactic bar in high-order moments of proper motions measured by Gaia
• Search for possibly evolutionary linked globular and open clusters
• Search for Stellar Streams Based on Data from the RAVE5 and Gaia TGAS Catalogues