arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2202.00690astro-ph.GAastro-ph.CO
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本宇宙中星系的冷星际介质

The cold interstellar medium of galaxies in the Local Universe

Amelie Saintonge, Barbara Catinella

摘要:

冷的星际介质(ISM)在星系演化过程中起着核心作用。它是通过恒星形成为星系生长提供燃料的储存库,是这些恒星形成的物质的储存库,也是影响整个星系的内部和外部过程的敏感示踪剂。因此,大量的努力已经投入到系统的调查冷ISM的星系在本地宇宙。这篇评论讨论了由此产生的网络的标度关系连接原子和分子气体质量的星系与他们的其他全球性质(恒星质量,形态,金属丰度,恒星形成活动.),以及它们对我们理解星系演化的意义。关键信息如下:(1)从气体的角度来看,有三个主要因素决定了星系的恒星形成率:其冷ISM的总质量,该气体中有多少是分子,以及任何分子气体转化为恒星的速率。所有这三个因素在本地星系群中系统地变化。(2)恒星形成主序列的形状和散布以及质量-金属丰度关系都与原子和分子气体的可用性有着深刻的联系。(3)未来的进展将来自于将我们对标度关系的探索扩展到新的参数空间(特别是矮星系),更好地将大样本星系的冷ISM与喂养它们的环境(特别是环星系介质)联系起来,并了解这些大尺度对分子云尺度上恒星形成过程效率的影响。

英文摘要:

The cold interstellar medium (ISM) plays a central role in the galaxy evolution process. It is the reservoir that fuels galaxy growth via star formation, the repository of material formed by these stars, and a sensitive tracer of internal and external processes that affect entire galaxies. Consequently, significant efforts have gone into systematic surveys of the cold ISM of the galaxies in the local Universe. This review discusses the resulting network of scaling relations connecting the atomic and molecular gas masses of galaxies with their other global properties (stellar masses, morphologies, metallicities, star formation activity...), and their implications for our understanding of galaxy evolution. Key take-home messages are as follows: (1) From a gas perspective, there are three main factors that determine the star formation rate of a galaxy: the total mass of its cold ISM, how much of that gas is molecular, and the rate at which any molecular gas is converted into stars. All three of these factors vary systematically across the local galaxy population. (2) The shape and scatter of both the star formation main sequence and the mass-metallicity relation are deeply linked to the availability of atomic and molecular gas. (3) Future progress will come from expanding our exploration of scaling relations into new parameter space (in particular the regime of dwarf galaxies), better connecting the cold ISM of large samples of galaxies with the environment that feeds them (the circumgalactic medium in particular), and understanding the impact of these large scales on the efficiency of the star formation process on molecular cloud scales.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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