论文标题
从光环到星系-II。恒星形成和淬火的基本关系
From haloes to galaxies -- II. The fundamental relations in star formation and quenching
论文作者
论文摘要
恒星形成和淬火是银河形成和进化中最重要的两个过程。我们在本地宇宙中探索了关键集成星系特性之间的相互关系，包括恒星质量$ m _*$，星形形成率（SFR），特定的SFR（SSFR），分子气体$ M _ {\ rm H_2} $，星形质量（SFE），分子气体气体和分解质量$ $ sTellar $ sTellar to senellar ys senellar senellar asselar asselar ys s s sentellar as s sentellar car。我们旨在确定这些关键星系属性及其相互关系之间最基本的扩展关系。我们显示集成的$ M _ {\ rm H_2} $ - SFR，SFR- $ M _*$和$ M _ {\ rm H_2} $ - $ M _*$关系可以简单地从$μ$ -SSSFR，SFE- $ $ $和SFE-SSSFR相关性转换。原则上，转化可以增加或减少每个关系的散射。有趣的是，我们发现后三个关系的分散都明显小于前三个相应关系。我们表明，意外地实现观察到的小散射的可能性非常接近零。这表明后三个关系的较小散布是由这些数量之间更基本的物理联系驱动的。然后，我们显示了以前关系中的大散射是由于它们的系统依赖性对其他星系特性以及恒星形成和淬火过程。我们提出SSFR- $ $ -SFE关系作为控制恒星形成和淬火过程的基本形成关系（FFR），并提供了一个简单的框架来研究星系进化。其他缩放关系，包括综合的Kennicutt-Schmidt定律，形成星形的主序列和分子气体主序列，都可以源自FFR。
Star formation and quenching are two of the most important processes in galaxy formation and evolution. We explore in the local Universe the interrelationships among key integrated galaxy properties, including stellar mass $M_*$, star formation rate (SFR), specific SFR (sSFR), molecular gas mass $M_{\rm H_2}$, star formation efficiency (SFE) of the molecular gas and molecular gas to stellar mass ratio $μ$. We aim to identify the most fundamental scaling relations among these key galaxy properties and their interrelationships. We show the integrated $M_{\rm H_2}$-SFR, SFR-$M_*$ and $M_{\rm H_2}$-$M_*$ relation can be simply transformed from the $μ$-sSFR, SFE-$μ$ and SFE-sSFR relation, respectively. The transformation, in principle, can increase or decrease the scatter of each relation. Interestingly, we find the latter three relations all have significantly smaller scatter than the former three corresponding relations. We show the probability to achieve the observed small scatter by accident is extremely close to zero. This suggests that the smaller scatters of the latter three relations are driven by a more fundamental physical connection among these quantities. We then show the large scatters in the former relations are due to their systematic dependence on other galaxy properties, and on star formation and quenching process. We propose the sSFR-$μ$-SFE relation as the Fundamental Formation Relation (FFR), which governs the star formation and quenching process, and provides a simple framework to study galaxy evolution. Other scaling relations, including integrated Kennicutt-Schmidt law, star-forming main sequence and molecular gas main sequence, can all be derived from the FFR.
