Kinematic characteristics of the Milky Way globular clusters based on Gaia DR-2 data

Chemerynska, I. V. and Ishchenko, M. V. and Sobolenko, M. O. and Khoperskov, S. A. and Berczik, Péter (2022) Kinematic characteristics of the Milky Way globular clusters based on Gaia DR-2 data. ADVANCES IN ASTRONOMY AND SPACE PHYSICS. ISSN 2227-1481

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Abstract

Using the data from Gaia (ESA) Data Release 2 we performed the orbital calculations of globular clusters (GCs) of the Milky Way. To explore possible close encounters (or collisions) between the GCs, using our own developed high-order phi-GRAPE code, we integrated (backward and forward) the orbits of 119 objects with reliable positions and proper motions. In calculations, we adopted a realistic axisymmetric Galactic potential (bulge + disk + halo). Using different impact conditions, we found four pairs of the six GCs that may have experienced an encounter within twice the sum of the half-mass radii (collisions) over the last 5Gyr: Terzan3 - NGC 6553, Terzan 3 - NGC 6218, Liller 1 - NGC 6522 and Djorg 2 - NGC 6553.

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