A PERFECT STARBURST CLUSTER MADE IN ONE GO: THE NGC 3603 YOUNG CLUSTER
A PERFECT STARBURST CLUSTER MADE IN ONE GO: THE NGC 3603 YOUNG CLUSTER
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DOI：
10.1088/0004-637x/787/2/158
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发表时间：
2014-03
期刊：
影响因子：
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通讯作者：
S. Banerjee;P. Kroupa
中科院分区：
文献类型：
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作者：
S. Banerjee;P. Kroupa
了解非常年轻的大质量恒星组成的独特的、近球形的无气体星团是如何形成巨大的、复杂的氢分子云的，这是天体物理学中最大的挑战之一。一种流行的想法认为，单个气体云分裂成许多新生的恒星，这些新生的恒星反过来激发并迅速驱逐剩余气体，形成一个没有气体的星系团。这项研究表明，上述经典范例很好地再现了银河系NGC3603恒星形成区的年轻中心星团(HD 97950)，特别是它的形状、内部运动和恒星的质量分布自然和一致地来自单一的模型计算。值得注意的是，同样的参数(恒星形成效率、气体喷射时间刻度和延迟)复制了HD 97950，就像复制猎户座星云星团、昂宿星团和R136一样。因此，目前的结果提供了有趣的证据，证明星团是通过单星爆发事件形成的，随后有大量残留气体被排出。
Understanding how distinct, near-spherical gas-free clusters of very young, massive stars shape out of vast, complex clouds of molecular hydrogen is one of the biggest challenges in astrophysics. A popular thought dictates that a single gas cloud fragments into many newborn stars which, in turn, energize and rapidly expel the residual gas to form a gas-free cluster. This study demonstrates that the above classical paradigm remarkably reproduces the well-observed central, young cluster (HD 97950) of the Galactic NGC 3603 star-forming region, in particular, its shape, internal motion, and mass distribution of stars naturally and consistently follow from a single model calculation. Remarkably, the same parameters (star formation efficiency, gas expulsion timescale, and delay) reproduce HD 97950, as were found to reproduce the Orion Nebula Cluster, Pleiades, and R136. The present results therefore provide intriguing evidence of formation of star clusters through single-starburst events followed by significant residual gas expulsion.