标题： 恒星形成区域中的多尺度动力学：引力与湍流的相互作用 显示英文标题

标题： Multi-scale dynamics in star-forming regions: the interplay between gravity and turbulence

摘要： 在本工作中，我们研究了在不同空间尺度和不同密度区域中引力与湍流之间的相互作用。 我们分析了一个由70个$\mu$的安静团块组成的样本，这些团块被分为三个表面密度区间，并我们将每组的动态与各自丝状结构的动态进行了比较。 最致密的团块平均形成于最致密的丝状结构中，并且它们具有最高的速度弥散值。 动能很可能通过湍流级联从丝状结构传递到团块，但我们识别出一个临界表面密度值，$\Sigma\simeq0.1$克/平方厘米$^{2}$，在此之上，动态从主要由湍流驱动转变为主要由引力驱动。 我们从数据中得到的情景是湍流与引力之间的连续相互作用，前者在所有尺度上创造结构，而后者在达到临界表面密度阈值时占据主导地位。 在最致密的丝状结构中，这种转变可能发生在秒差距甚至更大尺度上，导致整个区域的整体坍缩，并很可能形成大质量天体。 显示英文摘要

摘要： In this work we investigate the interplay between gravity and turbulence at different spatial scales and in different density regimes. We analyze a sample of 70 $\mu$m quiet clumps that are divided into three surface density bins and we compare the dynamics of each group with the dynamics of their respective filaments. The densest clumps form within the densest filaments on average, and they have the highest value of the velocity dispersion. The kinetic energy is transferred from the filaments down to the clumps most likely through a turbulent cascade, but we identify a critical value of the surface density, $\Sigma\simeq0.1$ g cm$^{2}$, above which the dynamics changes from being mostly turbulent-driven to mostly gravity-driven. The scenario we obtain from our data is a continuous interplay between turbulence and gravity, where the former creates structures at all scales and the latter takes the lead when the critical surface density threshold is reached. 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.