arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.06113astro-ph.GA
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分子云生命周期

The molecular cloud lifecycle

Mélanie Chevance, J. M. Diederik Kruijssen, Enrique Vazquez-Semadeni, Fumitaka Nakamura, Ralf Klessen, Javier Ballesteros-Paredes, Shu-ichiro Inutsuka, Angela A… 展开作者

Mélanie Chevance, J. M. Diederik Kruijssen, Enrique Vazquez-Semadeni, Fumitaka Nakamura, Ralf Klessen, Javier Ballesteros-Paredes, Shu-ichiro Inutsuka, Angela Adamo, Patrick Hennebelle

摘要:

巨分子云(GMC)和它们的恒星后代是星系的基石。GMC的物理特性及其演化与星系演化密切相关。星际介质的宏观性质传播到GMC的性质中,例如银河系和GMC尺度气体压力,表面密度和体积密度之间的相关性。这样,银河系环境就为GMC内的恒星形成设定了初始条件。在大质量恒星形成开始后,来自例如光电离、恒星风和超新星的恒星反馈最终有助于分散母云,将能量、动量和金属沉积到周围介质中,从而改变星系的性质。因此,这种由恒星形成和反馈控制的气体和恒星之间的物质循环是星系演化的主要驱动力。最近的大部分争论都集中在构成星系周期的各个演化阶段的持续时间上,以及这些阶段可以告诉我们驱动周期的物理机制。我们回顾了观测,理论和数值计算工作的结果,以建立一个动态的图片GMC演化,恒星形成和星系中的反馈的演化生命周期。

英文摘要:

Giant molecular clouds (GMCs) and their stellar offspring are the building blocks of galaxies. The physical characteristics of GMCs and their evolution are tightly connected to galaxy evolution. The macroscopic properties of the interstellar medium propagate into the properties of GMCs condensing out of it, with correlations between e.g. the galactic and GMC scale gas pressures, surface densities and volume densities. That way, the galactic environment sets the initial conditions for star formation within GMCs. After the onset of massive star formation, stellar feedback from e.g. photoionisation, stellar winds, and supernovae eventually contributes to dispersing the parent cloud, depositing energy, momentum and metals into the surrounding medium, thereby changing the properties of galaxies. This cycling of matter between gas and stars, governed by star formation and feedback, is therefore a major driver of galaxy evolution. Much of the recent debate has focused on the durations of the various evolutionary phases that constitute this cycle in galaxies, and what these can teach us about the physical mechanisms driving the cycle. We review results from observational, theoretical, and numerical work to build a dynamical picture of the evolutionary lifecycle of GMC evolution, star formation, and feedback in galaxies.

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