标题： 最大恒星质量、星团形成与复合恒星群体 显示英文标题

标题： The maximum stellar mass, star-cluster formation and composite stellar populations

摘要： 我们证明了星团中最亮恒星的质量与星团质量之间存在非平凡的相关性。 一个简单的算法根据该算法，星团用来自标准初始质量函数（IMF）的随机选择的恒星填充，但按质量递增排序，可以很好地描述观测数据。 基于从IMF中无序随机抽样的算法被排除的可能性大于0.9999。 对此的一种物理解释是，星团通过连续添加更亮的恒星形成，直到产生的反馈能量足以逆转云层收缩并停止进一步的恒星形成。 这对复合种群具有重要意义。 例如，10^4个质量为10^2 Msol的星团不会产生与单个质量为10^6 Msol的星团相同的初始质量函数（IMF）。 它还支持这样的观点，即积分星系初始质量函数（IGIMF）应该比恒星IMF更陡，并且它应该随着星系的恒星形成率而变化。 显示英文摘要

摘要： We demonstrate that the mass of the most massive star in a cluster correlates non-trivially with the cluster mass. A simple algorithm according to which a cluster is filled up with stars that are chosen randomly from the standard IMF but sorted with increasing mass yields an excellent description of the observational data. Algorithms based on random sampling from the IMF without sorted adding are ruled out with a confidence larger than 0.9999. A physical explanation of this would be that a cluster forms by more-massive stars being consecutively added until the resulting feedback energy suffices to revert cloud contraction and stops further star formation. This has important implications for composite populations. For example, 10^4 clusters of mass 10^2 Msol will not produce the same IMF as one cluster with a mass of 10^6 Msol. It also supports the notion that the integrated galaxial IMF (IGIMF) should be steeper than the stellar IMF and that it should vary with the star-formation rate of a galaxy.