论文标题
VMC调查-XLVII。大麦芽云中的湍流控制的分层恒星形成
The VMC survey -- XLVII. Turbulence-Controlled Hierarchical Star Formation in the Large Magellanic Cloud
论文作者
论文摘要
我们使用可见的和红外调查望远镜的数据对大麦哲伦云（LMC）中的上主序列恒星进行统计聚类分析，以对麦哲伦云进行天文学调查。我们在LMC以〜120平方度的范围内以15个显着性水平绘制了2500多个年轻恒星结构。这些结构的尺寸从几个parsecs到1 kpc以上。我们发现年轻的结构遵循幂律规模和质量分布。从周边地区的关系中，我们得出了1.44+-0.20的周边区域尺寸。根据质量大小的关系和尺寸分布，我们分别得出二维分形维度为1.50+-0.10和1.61+-0.20。我们发现表面密度分布由对数正态分布很好地代表。我们将Larson的关系应用于估计这些结构的速度分散和穿越时间。我们的结果表明，年轻恒星结构的分形性质是从它们形成的气云中遗传而来的，并且该体系结构是由超音速湍流产生的。我们的结果还表明，LMC中的恒星形成是从10 pc到700 pc的缩放。
We perform a statistical clustering analysis of upper main-sequence stars in the Large Magellanic Cloud (LMC) using data from the Visible and Infrared Survey Telescope for Astronomy survey of the Magellanic Clouds. We map over 2500 young stellar structures at 15 significance levels across ~120 square degrees centred on the LMC. The structures have sizes ranging from a few parsecs to over 1 kpc. We find that the young structures follow power-law size and mass distributions. From the perimeter-area relation, we derive a perimeter-area dimension of 1.44+-0.20. From the mass-size relation and the size distribution, we derive two-dimensional fractal dimensions of 1.50+-0.10 and 1.61+-0.20, respectively. We find that the surface density distribution is well-represented by a lognormal distribution. We apply the Larson relation to estimate the velocity dispersions and crossing times of these structures. Our results indicate that the fractal nature of the young stellar structures has been inherited from the gas clouds from which they form and that this architecture is generated by supersonic turbulence. Our results also suggest that star formation in the LMC is scale-free from 10 pc to 700 pc.
