膨胀壳层III的碎裂：寡头吸积和碎片的质谱
The fragmentation of expanding shells III: Oligarchic accretion and the mass spectrum of fragments
摘要：
我们使用SPH模拟通过线性和非线性机制来研究膨胀壳的引力破碎。分析结果时，使用了球谐分解来捕捉线性区域中结构的初始化;使用了Smith等人（2009年）基于势的方法来跟踪轻度非线性区域中团块的发展;使用了下沉粒子来捕捉高度非线性区域中最终结合物体的特性。在早期，轻度非线性阶段的碎裂，我们发现，块的质量函数仍然同意相当不错的质量函数预测的分析模型。然而，汇质量函数是完全不同的，在这个意义上是偏向于高质量的物体。这是因为，一旦凝聚的增长变得非线性，它往往会从自己本质上独立的水库中非竞争性地增长;我们称之为寡头吸积。
英文摘要：
We use SPH simulations to investigate the gravitational fragmentation of expanding shells through the linear and non--linear regimes. The results are analysed using spherical harmonic decomposition to capture the initiation of structure during the linear regime; the potential-based method of Smith et al. (2009) to follow the development of clumps in the mildly non-linear regime; and sink particles to capture the properties of the final bound objects during the highly non-linear regime. In the early, mildly non--linear phase of fragmentation, we find that the clump mass function still agrees quite well with the mass function predicted by the analytic model. However, the sink mass function is quite different, in the sense of being skewed towards high-mass objects. This is because, once the growth of a condensation becomes non-linear, it tends to be growing non-competitively from its own essentially separate reservoir; we call this Oligarchic Accretion.
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