Tidal Tails of Star Clusters as Tools for Studying the Milky-Way Potential

在银河系周围发现了越来越多的潮汐流和恒星超密度，其中一些起源不明，详细了解这些潮汐特征是必要的，因为它们被证明是确定星系团轨道的最佳工具，并以这种方式限制Milky Way势。研究星星团潮汐流的形成和演化。我们使用支持GPU的NBODY 6程序研究了潮汐流内部亚结构的形成以及银河晕中暗物质亚结构对这些动力学冷结构的影响，这些结果将有助于理解银河球状星团Palomar 5及其潮汐尾的明亮外观以及最近发现的GD-1流，将改善NGC 5466和NGC 4147的轨道测定，并将对银河系的潜力，特别是对银河系中暗物质的subhalos的属性的约束。因此，我们的工作将对我们对宇宙结构形成的理解进行重要的测试。

An increasing number of tidal streams and stellar overdensities, some of yet unknown origin, have been discovered around the Milky Way, making a detailed understanding of these tidal features desirable as they prove to be the best tools to determine a cluster’s orbit and in this way constrain the Milky-Way potential.Building upon recent theoretical and numerical work we apply for the first time high precision N-body codes to study the formation and evolution of tidal streams from star clusters. We use a GPU-enabled NBODY6 code to investigate the formation of substructure within tidal streams and the influence of dark-matter substructure in the Galactic halo on these dynamically cold structures.The results will help to understand the lumpy appearance of the Milky-Way globular cluster Palomar 5 and its tidal tails as well as the recently discovered GD-1 stream, will improve orbit determinations of NGC5466 and NGC4147, and will give constraints on the Milky-Way potential, especially on the properties of dark-matter subhalos in the Milky Way. Therefore, our work will give an important test of our understanding of structure formation in the Universe.