基于Gaia DR2数据的银河系球状星团运动学特征

IF 0.2 Q4 ASTRONOMY & ASTROPHYSICS

Advances in Astronomy and Space Physics Pub Date : 2022-01-16 DOI:10.17721/2227-1481.12.18-24

I. Chemerynska, M. A. Ishchenko, M. Sobolenko, S. Khoperskov, P. Berczik

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引用次数: 2

摘要

利用盖亚（欧空局）数据发布2的数据，我们对银河系的球状星团（GC）进行了轨道计算。为了探索GC之间可能的近距离相遇（或碰撞），使用我们自己开发的高阶φ-GRAPE代码，我们集成了119个位置可靠、运动正确的物体的前后轨道。在计算中，我们采用了现实的轴对称银河势（凸起+圆盘+光环）。使用不同的撞击条件，我们发现了四对六个GC，它们可能在过去5 Gyr内经历了半质量半径（“碰撞”）总和的两倍以内的碰撞：Terzan 3-NGC 6553，Terzan 3-NGC 6218，Liller 1-NGC 6522和Djorg 2-NGC 6553。

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Kinematic characteristics of the Milky Way globular clusters based on Gaia DR2 data

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 φ-GRAPE code, we integrated backward and forward orbits of 119 objects with reliable positions and proper motions. In the calculations, we adopted a realistic axisymmetric Galactic potential (bulge + disk + halo). Using different impact conditions, we found four pairs of six GCs that may have experienced an encounter within twice the sum of the half-mass radii ('collisions') over the last 5 Gyr: Terzan 3 — NGC 6553, Terzan 3 — NGC 6218, Liller 1 — NGC 6522 and Djorg 2 — NGC 6553.

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Advances in Astronomy and Space Physics ASTRONOMY & ASTROPHYSICS-

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