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arXiv 2407.20150astro-ph.GA
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大质量恒星形成区中的自相似团簇结构:从clump到embedded cluster的孤立演化

Self-similar cluster structures in massive star-forming regions: Isolated evolution from clumps to embedded clusters

J. W. Zhou, Pavel Kroupa, Sami Dib

AI总结:

利用dendrogram算法和最小生成树方法分析大质量恒星形成区,发现星团具有自相似结构,且从clump到embedded cluster的演化呈孤立局部性,并证实ATLASGAL clump的典型恒星形成效率约为0.33。

摘要:

我们使用dendrogram算法将恒星的表面密度分布分解为分层结构。这些结构与星团的多尺度结构相关联。在不同尺度下测量的星团质量-大小关系呈现出相似的幂律,这表明星团具有自相似结构。我们使用最小生成树方法测量了每个大质量恒星形成区中星团与气体clump之间的间距。星团之间、clump之间以及星团与clump之间的间距是可比的,这表明从clump到embedded cluster的演化是在孤立和局部进行的,且不会显著影响周围天体。通过比较ATLASGAL clump与所识别出的embedded cluster的质量函数,我们证实约0.33的恒定恒星形成效率可以作为ATLASGAL clump的典型值。

英文摘要:

We used the dendrogram algorithm to decompose the surface density distributions of stars into hierarchical structures. These structures were tied to the multiscale structures of star clusters. A similar power-law for the mass-size relation of star clusters measured at different scales suggests a self-similar structure of star clusters. We used the minimum spanning tree method to measure the separations between clusters and gas clumps in each massive star-forming region. The separations between clusters, between clumps, and between clusters and clumps were comparable, which indicates that the evolution from clump to embedded cluster proceeds in isolation and locally, and does not affect the surrounding objects significantly. By comparing the mass functions of the ATLASGAL clumps and the identified embedded clusters, we confirm that a constant star formation efficiency of $\approx$ 0.33 can be a typical value for the ATLASGAL clumps.

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