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arXiv 1208.3103astro-ph.GA
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剑鱼座30核心的双星系团

A double cluster at the core of 30 Doradus

E. Sabbi, D. J. Lennon, M. Gieles, S. E. de Mink, N. R. Walborn, J. Anderson, A. Bellini, N. Panagia, J. Maiz Apellaniz

备注：
14 pages, 5 figures
发表信息：
2012, ApJ 754, L37
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摘要：

根据对哈勃空间望远镜（HST）3号宽视场照相机（WFC 3）获得的数据的分析，我们报告了在大麦云星云中巨大的HII区剑鱼座30的核心中发现的两个不同的恒星星族。最紧密和最丰富的成分与R136的中心重合，比第二个更分散的团块年轻约100万年，位于东北方向约5.4 pc。我们注意到，这两个星团中大质量恒星的光谱类型支持了所提出的年龄差异。这两个亚星系团的形态和年龄差异表明，剑鱼座30号的核心可能正在进行合并。这一发现与湍流巨分子云分级破碎模型的预测一致，根据该模型，星团将是合并较小子结构的最终产物。

英文摘要：

Based on an analysis of data obtained with the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST) we report the identification of two distinct stellar populations in the core of the giant HII region 30Doradus in the Large Magellanic Cloud. The most compact and richest component coincides with the center of R136 and is ~1 Myr younger than a second more diffuse clump, located ~5.4 pc toward the northeast. We note that published spectral types of massive stars in these two clumps lend support to the proposed age difference. The morphology and age difference between the two sub-clusters suggests that an ongoing merger may occurring within the core of 30Doradus. This finding is consistent with the predictions of models of hierarchical fragmentation of turbulent giant molecular clouds, according to which star clusters would be the final products of merging smaller sub-structures.

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