探测极端条件下的团簇形成：蓝色致密星系中的大质量星团
Probing cluster formation under extreme conditions: massive star clusters in blue compact galaxies
摘要：
利用蓝色致密星系中数量众多、质量巨大的年轻星团来研究其宿主的性质。我们测试了BCGs是否遵循星团人口与其宿主之间的关系，例如星团贡献的总光度的分数作为平均恒星形成率密度的函数;最亮的最年轻星团的$V$带光度与平均宿主恒星形成率相关;以及团簇形成效率（即，星团中恒星形成的比例）与SFR密度的关系。我们发现，BCGs遵循的趋势，支持的情况下，团簇形成和环境属性的主机相关。在所有的图表中，它们占据了SFR较高的区域，正如在这些系统中运行的星爆的极端性质所预期的那样。我们发现，星团贡献了近20%的紫外光度的主机。我们认为，BCG星爆环境最有可能有利于巨大分子云的压缩和坍缩，提高了当地恒星形成的效率，从而形成了巨大的星团。估计的团簇形成效率支持这种情况。BCGs的团簇形成效率与亮红外星系和螺旋星暴核相当（平均值约为35%），远高于静止螺旋星系和矮星形成星系的8 - 10%。
英文摘要：
The numerous and massive young star clusters in blue compact galaxies (BCGs) are used to investigate the properties of their hosts. We test whether BCGs follow claimed relations between cluster populations and their hosts, such as the the fraction of the total luminosity contributed by the clusters as function of the mean star formation rate density; the $V$ band luminosity of the brightest youngest cluster as related to the mean host star formation rate; and the cluster formation efficiency (i.e., the fraction of star formation happening in star clusters) versus the density of the SFR. We find that BCGs follow the trends, supporting a scenario where cluster formation and environmental properties of the host are correlated. They occupy, in all the diagrams, the regions of higher SFRs, as expected by the extreme nature of the starbursts operating in these systems. We find that the star clusters contribute almost to the 20 % of the UV luminosity of the hosts. We suggest that the BCG starburst environment has most likely favoured the compression and collapse of the giant molecular clouds, enhancing the local star formation efficiency, so that massive clusters have been formed. The estimated cluster formation efficiency supports this scenario. BCGs have a cluster formation efficiency comparable to luminous IR galaxies and spiral starburst nuclei (the averaged value is about 35 %) which is much higher than the 8 - 10 % reported for quiescent spirals and dwarf star-forming galaxies.
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