论文标题
M31内光晕球状簇中的化学动力亚结构：最近的增生事件的进一步证据
Chemo-dynamical substructure in the M31 inner halo globular clusters: Further evidence for a recent accretion event
论文作者
论文摘要
基于金属性选择，我们确定了仙女座星系中内部光环球状簇的显着亚群，我们将其命名为DULAIS结构。它被区分为10-20个球状簇的共旋转组，在运动学上似乎与大多数内部光环群体相比，在运动学上与金属贫困更为差异。有趣的是，该dulais结构的轨道轴与最近使用仙女座外晕的球状簇的亚群鉴定的年轻积聚事件紧密相符，这强烈暗示了两者之间的因果关系。如果确认了这种联系，则对dulais结构中球状簇的运动学的自然解释是，它们在过去几十亿年内追溯到仙人掌的晕圈中的积聚（〜10^11 msun）可能是在较大的组中的一部分。
Based upon a metallicity selection, we identify a significant sub-population of the inner halo globular clusters in the Andromeda Galaxy which we name the Dulais Structure. It is distinguished as a co-rotating group of 10-20 globular clusters which appear to be kinematically distinct from, and on average more metal-poor than, the majority of the inner halo population. Intriguingly, the orbital axis of this Dulais Structure is closely aligned with that of the younger accretion event recently identified using a sub-population of globular clusters in the outer halo of Andromeda, and this is strongly suggestive of a causal relationship between the two. If this connection is confirmed, a natural explanation for the kinematics of the globular clusters in the Dulais Structure is that they trace the accretion of a substantial progenitor (~10^11 Msun) into the halo of Andromeda during the last few billion years, that may have occurred as part of a larger group infall.
