LEGUS团簇中的mmax-Mecl关系
The mmax-Mecl relation in the LEGUS clusters
AI总结：
研究通过模拟年轻星团验证mmax-Mecl关系的有效性，发现最优采样与观测一致，而随机采样不一致，支持星团形成具有自我调节机制。
摘要：
在非常年轻的星团中，最大恒星质量（mmax）与总恒星质量（Mecl）之间的关系（mmax-Mecl关系）在文献中仍存在争议。为了检验该关系的有效性，我们使用galIMF代码模拟了质量在10^2.5至10^5.0 M_sun之间、年龄为1-4 Myr的年轻星团，其中恒星质量从变化的初始恒星质量函数中最优采样。我们比较了这些结果与文献中关于 extragalactic 年轻星团的观测结果。我们通过PARSEC和COLIBRI轨道计算了Halpha辐射，使用Pegase代码计算Halpha辐射。为了考虑动态弹射，我们根据光谱类型随机移除恒星，遵循之前的N体模拟。此外，还考虑了年龄确定的不确定性以及场星的污染。我们的结果表明，在这里探讨的假设下，最优采样与考虑的extragalactic星团观测一致，而纯随机采样产生不一致的分布。这些发现支持一种高度自我调节的星团形成解释，其中恒星质量与初始质量函数最优对齐，而不是随机独立抽取。
英文摘要：
The relation between the maximum stellar mass in a very young cluster (mmax) and the total stellar mass of the cluster (Mecl), known as the mmax-Mecl relation, remains debated in the literature. To test the validity of this relation, we modelled young star clusters with masses between 102.5 and 105.0 M_sun and ages of 1-4 Myr using the galIMF code, in which stellar masses are optimally sampled from a varying initial stellar mass function. We compared the results with literature observations of extragalactic young star clusters. We incorporated stellar evolution via PARSEC and COLIBRI tracks and computed Halpha luminosities using the Pegase code. To account for dynamical ejections, we stochastically removed stars based on their spectral type, following previous N-body simulations. Additional sources of scatter, including uncertainties in age determination and contamination by field stars, were considered. Our results indicate that, under the assumptions explored here, optimal sampling is consistent with the extragalactic star cluster observations considered, whereas purely random sampling produces distributions that are not in agreement. These findings support a highly self-regulated interpretation of cluster formation in which stellar masses align optimally with the initial mass function rather than being drawn independently at random.
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