论文标题
恒星形成区域中的多尺度动力学：重力与湍流之间的相互作用
Multi-scale dynamics in star-forming regions: the interplay between gravity and turbulence
论文作者
论文摘要
在恒星形成过程的多尺度视图中，材料从大分子云流向团块和岩心。在这种范式中，尚不清楚是否是重力或湍流在塌陷期间，尤其是在高质量区域中驱动观察到的超音速非热运动，并且在其尺度上，重力最终在星际介质的湍流上占主导地位。为了研究这个问题，我们将70个微分Quiet团样品的动力学结合在一起，被选为覆盖各种质量和表面密度的动力学，以及它们嵌入的父丝的动力学。我们观察到湍流和重力之间的连续相互作用，在达到表面密度的临界值时，前者在各个尺度上产生结构，后者将带头。在最密的细丝中，这种过渡可以发生在parsec，甚至更大的尺度，从而导致整个地区的全球崩溃，并且最有可能形成大型物体。
In the multi-scale view of the star formation process the material flows from large molecular clouds down to clumps and cores. In this paradigm it is still unclear if it is gravity or turbulence that drives the observed supersonic non-thermal motions during the collapse, in particular in high-mass regions, and at which scales gravity becomes eventually dominant over the turbulence of the interstellar medium. To investigate this problem we have combined the dynamics of a sample of 70 micron-quiet clumps, selected to cover a wide range of masses and surface densities, with the dynamics of the parent filaments in which they are embedded. We observe a continuous interplay between turbulence and gravity, where the former creates structures at all scales and the latter takes the lead when a critical value of the surface density is reached, Sigma_th = 0.1 g cm^-2. In the densest filaments this transition can occur at the parsec, or even larger scales, leading to a global collapse of the whole region and most likely to the formation of the massive objects.
