Physical description of turbulent and gravitationally bound structures in molecular clouds in relation to the modeling of the general cloud structure

分子云是星星形成的纳塔尔环境。拟议的项目主要集中在它们在局部引力坍缩之前的早期演化阶段。它的目的是加深我们对可能是恒星或星团的祖先的MC中的致密结构（团块）以及团块物理特性和一般云结构之间的联系的理解。该项目的两个主要目标是：i）MC一般结构的建模和作为模型组成部分的团块和星前核的质量分布的推导;以及，ii）广泛使用的团块发现技术应用于高质量的观测和数值数据之间的方法比较，这将使迭代详细说明团块描述的统计方法。第一个目标是实现通过替代配方的统计方法，以及通过探索的体积和柱密度分布的性质，在真实的云或数值数据集从模拟湍流星际介质与重力。扩展的统计方法来描述自引力星前核也预见。该项目的第二个目标是通过深入研究利用基于不同物理前提的算法Gaussclubs和树状图检测的团块特征来实现。

The molecular clouds (MCs) are the natal environment for star formation. The proposed Project is focused mainly on their early evolutionary stage which precedes local gravitational collapse(s). It aims to deepen our understanding on the dense structures (clumps) in MCs that might be progenitors of stars or stellar clusters and on the link between clump physical characteristics and general cloud structure. Two main objectives of this Project are: i) modeling of MC general structure and derivation of the mass distributions of clumps and prestellar cores as integral components of the model; and, ii) methodological comparison between widely used clump-finding techniques applied to high-quality observational and numerical data which would enable iterative elaboration of the statistical approach for clump description. The first objective is to be achieved through alternative formulation of the statistical approach for clump description as well through exploring the properties of the volume- and column-density distributions in real clouds or in numerical datasets obtained from simulations of turbulent interstellar media with gravity. An extension of the statistical approach to describe self-gravitating prestellar cores is also foreseen. The second objective of the Project is to be achieved through in-depth study of characteristics of clumps detected by use of the algorithms Gaussclumps and Dendrograms which are based on different physical premises.