论文标题
云层形成云，外部驱动的湍流
Star Cluster Formation in Clouds with Externally Driven Turbulence
论文作者
论文摘要
已知星团在湍流的分子云中形成。湍流在分子云中的驱动方式以及这种对恒星形成的影响仍不清楚。我们将模拟设置与湍流的驱动器进行比较，并在周期盒中的设置中到处驾驶，其中湍流仅在盒子的外部驱动。我们分析了由云形成的气体分布，运动学和恒星种群。两种设置都成功地产生了具有功率定律结构功能的湍流速度场，外部驱动的云具有更中心，整体，团块，而完全驱动的云具有许多较小，更分散的团块。恒星形成遵循云形态产生较大的簇，在外部驱动的模拟中具有高恒星形成效率，并且在完全驱动的情况下具有较低的恒星形成效率。我们得出的结论是，类似于全球层次崩溃（GHC）场景的外部驱动方法会产生与观察结果更紧密匹配的星形簇。
Star clusters are known to be formed in turbulent molecular clouds. How turbulence is driven in molecular clouds and what effect this has on star formation is still unclear. We compare a simulation setup with turbulent driving everywhere in a periodic box with a setup where turbulence is only driven around the outside of the box. We analyse the resulting gas distribution, kinematics, and the population of stars that are formed from the cloud. Both setups successfully produce a turbulent velocity field with a power law structure function, the externally driven cloud has a more central, monolithic, clump, while the fully driven cloud has many smaller, more dispersed, clumps. The star formation follows the cloud morphology producing large clusters, with high star forming efficiency in the externally driven simulations and sparse individual star formation with much lower star formation efficiency in the fully driven case. We conclude that the externally driven method, which resembles a Global Hierarchical Collapse (GHC) scenario, produces star clusters that more closely match with observations.
