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

分子云（MCs）是恒星形成的初始环境。建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。它旨在加深我们对mc中可能是恒星或星团的祖先的致密结构（团块）以及团块物理特性与一般云结构之间的联系的理解。该项目的两个主要目标是：1)MC一般结构的建模和团块和星前核的质量分布的推导作为模型的组成部分；ii)对应用于高质量观测数据和数值数据的广泛使用的团块查找技术进行方法学比较，这将使团块描述的统计方法能够反复阐述。第一个目标是通过对团块描述的统计方法的替代公式以及通过探索真实云中或从具有重力的湍流星际介质模拟中获得的数值数据集中的体积和柱密度分布的特性来实现。还预见了统计方法的扩展，以描述自引力的星前核。该项目的第二个目标是通过深入研究基于不同物理前提的高斯团块和树形图算法检测到的团块特征来实现。

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.