分层合并情景中的存活婴儿死亡率
Surviving infant mortality in the hierarchical merging scenario
摘要：
我们研究气体驱逐最初的子结构和平衡星团的影响。我们执行$N$体模拟星团的演化在静态背景电位，然后删除潜在的模型气体排出。我们发现，初始恒星形成效率不是一个很好的衡量星团的生存能力。这是因为恒星的分布可能会发生显著的变化，从而导致恒星势和气体势的相对重要性发生很大的变化。我们发现，初始恒星分布和速度色散是更重要的参数比初始恒星形成效率，和非常低的恒星形成效率的集群可以生存的气体驱逐。我们认为，这是在集群的初始条件，而不是在他们的恒星形成效率的变化，导致一些集群被摧毁，而少数生存。
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 removing that potential to model gas expulsion. We find that the initial star formation efficiency is not a good measure of the survivability of star clusters. This is because the stellar distribution can change significantly, causing a large change in the relative importance of the stellar and gas potentials. We find that the initial stellar distribution and velocity dispersion are far more important parameters than the initial star formation efficiency, and that clusters with very low star formation efficiencies can survive gas expulsion. We suggest that it is variations in cluster initial conditions rather than in their star formation efficiencies that cause some clusters to be destroyed while a few survive.
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