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arXiv 2404.09673astro-ph.GA
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宇宙正午时期尘埃恒星形成星系中分子气体的天体化学

Astrochemistry of the molecular gas in Dusty Star-Forming Galaxies at the Cosmic Noon

Francesca Perrotta, Martina Torsello, Marika Giulietti, Andrea Lapi

AI总结:

该研究综述了宇宙正午时期尘埃恒星形成星系中分子气体的天体化学研究进展,梳理了相关核心参数与未决问题,明确了分子气体在恒星形成过程中的关键示踪与塑造作用。

摘要:

远红外(FIR)和亚毫米波观测已证实,在过去120亿年里,尘埃遮蔽的恒星形成在恒星质量组装过程中发挥着核心作用。在红移z介于2到4之间时,大部分恒星形成活动被尘埃包裹,且尘埃恒星形成星系(DSFGs,dusty star forming galaxies)的恒星质量密度约占总恒星质量密度的一半。恒星形成发生在致密分子云中,并受到星系能量收支相关的所有星际介质(ISM)组分间复杂相互作用的调控,这些组分包括气体、尘埃、宇宙射线、星际电磁场、引力场、暗物质。分子气体是恒星形成气体与其复杂环境之间的实际纽带,提供了关于恒星形成过程的最丰富信息。然而,要解释分子谱线,需要对调控分子形成并决定云内分子丰度的天体化学网络进行复杂建模,还需要对分子能级得以布居的气体物理条件进行建模。本文批判性地综述了用于预测DSFGs中分子信号所需的主要天体化学参数。我们回顾了关于DSFGs星际介质的现有认知与未解决的问题,突出了分子气体作为恒星形成过程的示踪物与塑造者的关键作用。

英文摘要:

FIR and submm observations have established the fundamental role of dust-obscured star formation in the assembly of stellar mass over the past 12 billion years. At z between 2 and 4, the bulk of star formation is enshrouded in dust, and dusty star forming galaxies (DSFGs) contain about half of the total stellar mass density. Star formation develops in dense molecular clouds, and is regulated by a complex interplay between all the ISM components that contribute to the energy budget of a galaxy: gas, dust, cosmic rays, interstellar electromagnetic fields, gravitational field, dark matter. Molecular gas is the actual link between star forming gas and its complex environment, providing by far the richest amount of information about the star formation process. However, molecular lines interpretation requires complex modeling of astrochemical networks, which regulate the molecular formation and establishes molecular abundances in a cloud, and a modeling of the physical conditions of the gas in which molecular energy levels become populated. This paper critically reviews the main astrochemical parameters needed to get predictions about molecular signals in DSFGs. We review the current knowledge and the open questions about the interstellar medium of DSFGs, outlying the key role of molecular gas as a tracer and shaper of the star formation process.

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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