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arXiv 2203.09562astro-ph.GA
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恒星形成的初始条件:丝状体ISM的物理描述

Initial Conditions for Star Formation: A Physical Description of the Filamentary ISM

A. Hacar, S Clark, F. Heitsch, J. Kainulainen, G. Panopoulou, D. Seifried, R. Smith

摘要:

星际介质在很宽的尺度范围内都包含有沉积结构。了解这种结构的作用,作为气体穿过尺度的管道和局部物理学的诊断工具,是恒星形成研究的主要焦点。我们回顾了近年来在ISM中研究沉积结构,解释其物理过程的属性,探索形成和演化情景的进展。我们从观测和理论的角度,包括从银河系尺度的细丝到十分之一秒差距尺度的细丝,包括分子和原子结构。除了文献综述,我们还收集了大量来自不同调查的目录数据,并提供了迄今为止最全面的建筑结构普查。我们的普查包括22 803个传统建筑,促进了整体视角和新的见解。我们使用我们的人口普查进行荟萃分析,导致超过四个数量级的长度和八个质量的细丝属性的描述。我们的分析强调的层次和动态的性质,间接结构。纤维并不是孤立存在的,它们通常也类似于接近平衡的静态结构。我们建议,吸积在灯丝的形成和演化设置一些关键的缩放特性的灯丝。这突出了吸积在暗条形成和演化过程中的作用,也为恒星形成设定了初始条件。总的来说,在过去的十年里,对地壳结构的研究一直是由观测驱动的。虽然在测量细丝的基本性质方面已经取得了很大进展,但我们对它们的形成和演变的理解显然是缺乏的。在这方面,我们确定了一些方向和问题,我们认为最紧迫的领域。

英文摘要:

The interstellar medium contains filamentary structure over a wide range of scales. Understanding the role of this structure, both as a conduit of gas across the scales and a diagnostic tool of local physics, is a major focus of star formation studies. We review recent progress in studying filamentary structure in the ISM, interpreting its properties in terms of physical processes, and exploring formation and evolution scenarios. We include structures from galactic-scale filaments to tenth-of-a-parsec scale filaments, comprising both molecular and atomic structures, from both observational and theoretical perspectives. In addition to the literature overview, we assemble a large amount of catalogue data from different surveys and provide the most comprehensive census of filamentary structures to date. Our census consists of 22 803 filamentary structures, facilitating a holistic perspective and new insights. We use our census to conduct a meta-analysis, leading to a description of filament properties over four orders of magnitudes in length and eight in mass. Our analysis emphasises the hierarchical and dynamical nature of filamentary structures. Filaments do not live in isolation, nor they generally resemble static structures close to equilibrium. We propose that accretion during filament formation and evolution sets some of the key scaling properties of filaments. This highlights the role of accretion during filament formation and evolution and also in setting the initial conditions for star formation. Overall, the study of filamentary structures during the past decade has been observationally driven. While great progress has been made on measuring the basic properties of filaments, our understanding of their formation and evolution is clearly lacking. In this context, we identify a number of directions and questions we consider most pressing for the field.

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