分层合并情景中的婴儿死亡率：取决于气体排出时间尺度
Infant mortality in the hierarchical merging scenario: Dependency on gas expulsion timescales
摘要：
我们研究气体驱逐最初的子结构和平衡星团的影响。我们进行N-体模拟星团的演化在一个静态的背景电位，然后调整该电位模型气体驱逐。我们调查的影响，改变气体被删除的速度，并在气体删除开始的瞬间。降低气体被排出的速率会导致簇存活率的增加。Quantitatively，这种依赖性是大约与以前的研究，尽管他们使用的平滑，和维里化的初始恒星分布。然而，在气体驱逐发生的瞬间被发现有一个强大的集群响应气体去除效果。我们发现，如果气体驱逐发生在一个交叉时间之前，集群响应是很难描述的任何全球参数。此外，在真正的集群中，气体排出的瞬间是不受约束的。因此，我们的结果强调了星团对气体排出的高度随机和可变的响应。
英文摘要：
We examine the effects of gas expulsion on initially sub-structured and out-of-equilibrium star clusters. We perform N-body simulations of the evolution of star clusters in a static background potential before adjusting that potential to model gas expulsion. We investigate the impact of varying the rate at which the gas is removed, and the instant at which gas removal begins. Reducing the rate at which the gas is expelled results in an increase in cluster survival. Quantitatively, this dependency is approximately in agreement with previous studies, despite their use of smooth, and virialised initial stellar distributions. However, the instant at which gas expulsion occurs is found to have a strong effect on cluster response to gas removal. We find if gas expulsion occurs prior to one crossing time, cluster response is poorly described by any global parameters. Furthermore in real clusters the instant of gas expulsion is poorly constrained. Therefore our results emphasis the highly stochastic and variable response of star clusters to gas expulsion.
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