论文标题
静态星系的气体分数的演变是由于其创建率而建立的
The evolution of the gas fraction of quiescent galaxies modeled as a consequence of their creation rate
论文作者
论文摘要
我们借助基于良好的经验关系（例如恒星质量函数和恒星形成的主要序列）的简单模型来讨论目前从最近的分析中出现的静态星系星际介质的演变。该模型的目的是描述观察到的数量，而无需对淬火过程的性质做出具体假设，而要依赖于它们可观察到的后果。我们发现，在静止星系中高红移时看到或建议的高气体分数，并且它们在早期的明显轻度演化主要归因于祖细胞效应，最近最近淬灭了〜10％气体分数的星系占据了静态星系，直到Z〜1。在同一情况下，在局部早期型星系中测得的低得多的气体和灰尘分数被解释为在〜2 Gyr时尺度上其星际培养基稳定耗竭的产物，再加上更高的气体过量事件的较高部分。
We discuss the evolution of the interstellar medium of quiescent galaxies, currently emerging from recent analyses, with the help of a simple model based on well-established empirical relations such as the stellar mass functions and the main sequence of star formation. This model is meant to describe observed quantities without making specific assumptions on the nature of quenching processes, but relying on their observable consequences. We find that the high gas fractions seen or suggested at high redshift in quiescent galaxies, and their apparent mild evolution at early times, can be mostly attributed to a progenitor effect where recently quenched galaxies with ~10% gas fractions dominate the quiescent galaxy population until z~1. In the same context, the much lower gas and dust fractions measured in local early-type galaxies are interpreted as the product of the steady depletion of their interstellar medium on a ~2 Gyr timescale, coupled with a higher fraction of more gas-exhaustive events.
