标题： 气体喷射和大质量年轻星团的破坏 显示英文标题

标题： Gas expulsion and the destruction of massive young clusters

摘要： 我们检查年轻大质量恒星团的光度和动力学质量估计。 对于许多年轻的（小于50 Myr）团块，光度和动力学质量估计之间存在显著差异。 我们将这一现象解释为许多年轻的团块处于非维里平衡状态（动力学质量估计中假设了维里平衡），因为这些团块在星形成过程中排出气体后正在进行剧烈松弛。 我们表明，如果假设光度质量估计是正确的（对于标准初始质量函数），那么至少50%已知动力学质量的年轻团块可能在其形成后的几亿年内被摧毁。 即使那些将保留一个束缚核心的团块，也可能失去大量恒星质量。 我们还表明，在排出气体后发生的剧烈松弛期间，核心半径和其他结构参数会发生显著变化，它们应被视为瞬时值，不一定反映团块的最终状态。 特别是我们注意到，在年轻的大麦哲伦云/小麦哲伦云团块中观察到的核心半径增加，可以很好地用快速气体损失效应来解释。 显示英文摘要

摘要： We examine the luminosity and dynamical mass estimates for young massive stellar clusters. For many young (<50 Myr) clusters, the luminosity and dynamical mass estimates differ by a significant amount. We explain this as being due to many young clusters being out of virial equilibrium (which is assumed in dynamical mass estimates) because the clusters are undergoing violent relaxation after expelling gas not used in star formation. We show that, if we assume that luminous mass estimates are correct (for a standard IMF), at least 50 per cent of young clusters for which dynamical masses are known are likely to be destroyed within a few 10s Myr of their formation. Even clusters which will retain a bound core may lose a large fraction of their stellar mass. We also show that the core radius and other structural parameters change significantly during the violent relaxation that follows gas expulsion and that they should be considered instantaneous values only, not necessarily reflecting the final state of the cluster. In particular we note that the increasing core radii observed in young LMC/SMC clusters can be well explained as an effect of rapid gas loss.