初始星团质量函数的形状：它告诉我们关于局部恒星形成效率的信息
The shape of the initial cluster mass function: what it tells us about the local star formation efficiency
摘要：
我们探讨了如何驱逐气体从星团形成的云核由于超新星爆炸影响的形状的初始集群质量函数，即质量函数的星团时，气体驱逐的影响结束。我们证明，如果形成集群的气体核心的半径是大致恒定的核心质量范围内，由观测支持，那么更大的核心进行较慢的气体排出。因此，对于一个给定的恒星形成效率，更大质量的核心在气体排出后保留了更大比例的恒星。因此，初始的星团质量函数可能与核心质量函数大不相同，最终的形状取决于恒星形成效率。质量无关的恒星形成效率约为20%，将幂律核心质量函数变成钟形的初始星团质量函数，而质量无关的效率约为40%，保持核心质量函数的形状。
英文摘要：
We explore how the expulsion of gas from star-cluster forming cloud-cores due to supernova explosions affects the shape of the initial cluster mass function, that is, the mass function of star clusters when effects of gas expulsion are over. We demonstrate that if the radii of cluster-forming gas cores are roughly constant over the core mass range, as supported by observations, then more massive cores undergo slower gas expulsion. Therefore, for a given star formation efficiency, more massive cores retain a larger fraction of stars after gas expulsion. The initial cluster mass function may thus differ from the core mass function substantially, with the final shape depending on the star formation efficiency. A mass-independent star formation efficiency of about 20 per cent turns a power-law core mass function into a bell-shaped initial cluster mass function, while mass-independent efficiencies of order 40 per cent preserve the shape of the core mass function.
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