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arXiv 0910.0871astro-ph.GA
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约束星团破坏机制

Constraining star cluster disruption mechanisms

I. S. Konstantopoulos, N. Bastian, M. Gieles, H. J. G. L. M. Lamers

摘要:

星团存在于各种环境中,它们的形成和演化与恒星形成过程密不可分。它们的最终毁灭可能是在不同时间由若干因素造成的,但这一过程可以通过研究星团的年龄分布作为一个整体来研究。人口集群样本的观察揭示了指数约为-1的幂律分布。在这项工作中,我们使用M33作为一个测试案例来研究一个原型集群人口的年龄分布,并表明它实际上是定义这种趋势的质量检测限的不断变化的形状。也就是说,任何有限星等的样品似乎都遵循dN/dt=1/t,而根据质量切割样品会产生复合结构,这可能意味着团簇破裂过程对质量的依赖。在这个框架的背景下,我们从理论和观测的角度来研究不同的集群破坏模型。

英文摘要:

Star clusters are found in all sorts of environments and their formation and evolution is inextricably linked to the star formation process. Their eventual destruction can result from a number of factors at different times, but the process can be investigated as a whole through the study of the cluster age distribution. Observations of populous cluster samples reveal a distribution following a power law of index approximately -1. In this work we use M33 as a test case to examine the age distribution of an archetypal cluster population and show that it is in fact the evolving shape of the mass detection limit that defines this trend. That is to say, any magnitude-limited sample will appear to follow a dN/dt=1/t, while cutting the sample according to mass gives rise to a composite structure, perhaps implying a dependence of the cluster disruption process on mass. In the context of this framework, we examine different models of cluster disruption from both theoretical and observational standpoints.

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