The molecular gas main sequence and Schmidt-Kennicutt relation are fundamental, the star-forming main sequence is a (useful) byproduct
The molecular gas main sequence and Schmidt-Kennicutt relation are fundamental, the star-forming main sequence is a (useful) byproduct
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分子气体主序和施密特-肯尼卡特关系是基础，恒星形成主序是（有用的）副产品
DOI：
10.1093/mnras/stac3413
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发表时间：
2023
影响因子：
4.8
通讯作者：
Baker W
中科院分区：
文献类型：
--
作者：
Baker W
我们研究了局部恒星形成星系的恒星形成率 (SFR)、恒星质量 (M*) 和分子气体质量 () 之间的关系。我们进一步研究高 z(z=1-3) 星系和活动星系核 (AGN) 局部样本的宿主的这些关系。我们通过采用偏相关系数和随机森林回归来探索这些依赖性中哪些是内在的，哪些是间接的副产品。我们发现，对于局地恒星形成星系、高z星系和活动星系核宿主星系，施密特-肯尼卡特（SK）关系（Between和SFR）和分子气体主序带（MGMS；BetweenandM*）是内在的主要关系，而M*和SFR之间的关系，即恒星形成主序带（SFMS），是前两者的间接副产品。因此，SFMS 并不是局部或高 z 星系的基本标度关系。我们找到了 MGMS 和 SK 关系随宇宙时间演化的证据，其中，在给定的恒星质量下，红移越高，分子气体质量和恒星形成效率就越大。我们提供了 MGMS 和 SK 关系随红移演化的参数化，展示了它们如何结合起来形成观察到的 SFMS 演化。此外，我们发现本地 AGN 主星系遵循 AGN-MGMS 关系（以及 AGN-SK 关系），其中与本地恒星形成星系相比，对于给定的 M*，MGMS 偏移较低。
We investigate the relationship between the star formation rate (SFR), stellar mass (M*), and molecular gas mass () for local star-forming galaxies. We further investigate these relationships for high-z(z= 1–3) galaxies and for the hosts of a local sample of active galactic nuclei (AGN). We explore which of these dependencies are intrinsic and which are an indirect byproduct by employing partial correlation coefficients and random forest regression. We find that for local star-forming galaxies, high-zgalaxies, and AGN host galaxies, the Schmidt–Kennicutt (SK) relation (betweenand SFR) and the molecular gas main sequence (MGMS; betweenandM*) are intrinsic primary relations, while the relationship betweenM*and SFR, i.e. the star-forming main sequence (SFMS), is an indirect byproduct of the former two. Hence the SFMS is not a fundamental scaling relation for local or high-zgalaxies. We find evidence for both the evolution of the MGMS and SK relation over cosmic time, where, at a given stellar mass, the higher the redshift, the greater the molecular gas mass and the star formation efficiency. We offer a parametrization of both the MGMS and SK relation’s evolution with redshift, showing how they combine to form the observed evolution of the SFMS. In addition, we find that the local AGN host galaxies follow an AGN–MGMS relation (as well as an AGN–SK relation), where the MGMS is offset to lowerfor a givenM*compared to local star-forming galaxies.