Evolution of fractality and rotation in embedded star clusters
Evolution of fractality and rotation in embedded star clusters
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嵌入式星团中分形和旋转的演化
DOI：
10.1093/mnras/staa1383
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发表时间：
2020
影响因子：
4.8
通讯作者：
S. Rastello
中科院分区：
文献类型：
--
作者：
A. Ballone;M. Mapelli;Ugo N Di Carlo;S. Torniamenti;M. Spera;S. Rastello
越来越多的观测表明，年轻星团可能会保留其形成过程的印记。特别是，子结构和旋转的程度可能是形成这些系统的母体分子云坍塌的直接结果。原则上，这类资产可以被淘汰，但预计它们也会对这些制度的放松产生影响。我们运行并分析了一组10个流体力学模拟，这些模拟是通过湍流大质量分子云的坍塌形成嵌入的星团的。我们系统地研究了我们的星团的分形性，表明它们都是非常亚结构的(分维D=1.0-1.8)。我们还发现，随着时间的推移，分形性在小尺度上缓慢减少，而在较长时间尺度上的大尺度上保持不变。在演化的每一时刻，都能在不同的模拟中发现旋转的特征，即使是对于轻微的超维里子结构，这证明了母分子气体将其部分角动量转移到新的恒星系统。
More and more observations indicate that young star clusters could retain imprints of their formation process. In particular, the degree of substructuring and rotation are possibly the direct result of the collapse of the parent molecular cloud from which these systems form. Such properties can, in principle, be washed-out, but they are also expected to have an impact on the relaxation of these systems. We ran and analysed a set of 10 hydrodynamical simulations of the formation of embedded star clusters through the collapse of turbulent massive molecular clouds. We systematically studied the fractality of our star clusters, showing that they are all extremely substructured (fractal dimension D = 1.0–1.8). We also found that fractality is slowly reduced, with time, on small scales, while it persists on large scales on longer time-scales. Signatures of rotation are found in different simulations at every time of the evolution, even for slightly supervirial substructures, proving that the parent molecular gas transfers part of its angular momentum to the new stellar systems.
动量恒星反馈影响下巨分子云的破裂和束缚星团的形成
影响因子：
4.8
作者：
Li, Hui;Vogelsberger, Mark;Marinacci, Federico;Gnedin, Oleg Y
通讯作者：
Gnedin, Oleg Y