论文标题
基于GAIA DR2数据的银河系的运动特征
Kinematic characteristics of the Milky Way globular clusters based on Gaia DR2 data
论文作者
论文摘要
使用GAIA（ESA）数据版本2的数据，我们进行了银河系的球状簇（GC）的轨道计算。为了探索GCS之间可能的紧密相遇（或碰撞），使用我们自己的高阶Phi-Grape代码，我们向后和向前集成了具有可靠位置和适当动作的119个对象的轨道。在计算中，我们采用了逼真的轴对称银河电位（Bulge + Disk + Halo）。在使用不同的影响条件下，我们发现了六个GC中的四对，可能在最后5GYR中经历了半质量半径（碰撞）之和两倍的相遇：Terzan3 -NGC 6553，Terzan 3 -NGC 6218，Liller 1- Liller 1 -NGC 6522和DJORG和DJORG 2 -NGC 6553。
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.
