幼年球状星团的内部性质与其形成环境的联系
Linking the Internal Properties of Infant Globular Clusters to their Formation Environments
摘要：
我们在高分辨率宇宙学模拟中研究了前十亿年（FiBY）计划中婴儿球状星团（GC）候选者的形成。通过分析系统在能量和角动量平面的演变，我们确定的红移在婴儿GC第一次成为引力约束，我们发现的证据，其气体和恒星成分的径向下降。坍缩似乎是由内部自引力驱动的，然而，最初的触发因素来自外部环境。婴儿GC的相空间行为也使我们能够识别一些特征分组的对象。这种基于内部性质的分类似乎反映在形成环境中：属于同一类的GC候选者被发现在类似形态的宿主星系中，大多数的婴儿GC位于不规则的原始星系中。最后，通过检查两个GC候选人，只包含恒星z = 6，我们发现，超新星反馈是背后的气体缺乏的主要物理机制，系统随后响应近似绝热膨胀。这样的新生GC候选者已经类似于我们目前在本地宇宙中观察到的GC。
英文摘要：
We investigate the formation of infant globular cluster (GC) candidates in high-resolution cosmological simulations from the First Billion Years (FiBY) project. By analysing the evolution of the systems in the energy and angular momentum plane, we identify the redshift at which the infant GCs first became gravitationally bound, and we find evidence of radial infall of their gaseous and stellar components. The collapse appears to be driven by internal self-gravity, however, the initial trigger is sourced from the external environment. The phase space behaviour of the infant GCs also allows us to identify some characteristic groupings of objects. Such a classification based on internal properties appears to be reflected in the formation environment: GC candidates that belong to the same class are found in host galaxies of similar morphology, with the majority of the infant GCs located in clumpy, irregular proto-galaxies. Finally, through the inspection of two GC candidates that contain only stars by z = 6, we find that supernova feedback is the main physical mechanism behind their dearth of gas and that the systems subsequently respond with an approximately adiabatic expansion. Such infant GC candidates already resemble the GCs we currently observe in the local Universe.
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