A central tenet of the current cosmological paradigm is that galaxies grow over time through the accretion of smaller systems. Here, we present new kinematic measurements near the centre of one of the densest pronounced substructures, the South-West Cloud, in the outer halo of our nearest giant neighbour, the Andromeda galaxy. These observations reveal that the kinematic properties of this region of the South-West Cloud are consistent with those of PA-8, a globular cluster previously shown to be co-spatial with the stellar substructure. In this sense the situation is reminiscent of the handful of globular clusters that sit near the heart of the Sagittarius dwarf galaxy, a system that is currently being accreted into the Milky Way, confirming that accretion deposits not only stars but also globular clusters into the halos of large galaxies.

翻译：目前宇宙范式的中心原则是星系通过较小系统的积分随着时间而增长。 在这里,我们展示了在最稠密的亚结构之一中心,西南云的中心,在我们最近的大邻居安卓美达星系的外光中。这些观测显示,西南云的这个区域的动态特性与PA-8的特性是一致的,而PA-8以前曾显示,这个星团群与星系的亚结构是同一空间的。从这个意义上讲,这种情况使人想起了目前正在进入银河系的星系,这个系统不仅将恒星沉积,而且将星团团团聚入大星系的海洞。