新生恒星超星系团对恒星的捕获
On the trapping of stars by a newborn stellar supercluster
摘要：
Fellhauer等人进行的数值实验（MNRAS，372，338，2006）表明，一个超星系团可以从它所属的星系捕获大约40%的质量。然而，在这些实验中，星系团的质量是凭空产生的，而不是来自星系中已经存在的质量。在这里，我们使用一个思想实验，加上一些简单的计算，以表明这两个场景的动态效果之间的差异（即，质量创造与质量集中）实际上是非常重要的。我们还提出了新的数值实验的结果，模拟通过质量浓度的集群的形成，表明捕获严重依赖于团簇形成的过程中，获得的质量的量基本上小于那些从质量创建。
英文摘要：
Numerical experiments conducted by Fellhauer et al. (MNRAS, 372, 338, 2006) suggest that a supercluster may capture up to about 40 per cent of its mass from the galaxy where it belongs. Nevertheless, in those experiments the cluster was created making appear its mass out of nothing, rather than from mass already present in the galaxy. Here we use a thought experiment, plus a few simple computations, to show that the difference between the dynamical effects of these two scenarios (i.e., mass creation vs. mass concentration) is actually very important. We also present the results of new numerical experiments, simulating the formation of the cluster through mass concentration, that show that trapping depends critically on the process of cluster formation and that the amounts of gained mass are substantially smaller than those obtained from mass creation.
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