The metallicity's fundamental dependence on both local and global galactic quantities
The metallicity's fundamental dependence on both local and global galactic quantities
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金属丰度对局部和全球星系数量的根本依赖
DOI：
10.1093/mnras/stac3594
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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
在kpc尺度上研究了局部成星星系中气相金属丰度、恒星质量面密度（α *）、星星形成速率面密度（α SFR）和分子气体面密度（α）之间的标度关系。我们采用光学积分场光谱的映射附近Galerkin在阿帕奇点天文台（MANGA）的调查，和阿尔马数据的一个子集的MANGA星系。我们使用偏相关系数和随机森林回归，以确定相对重要性的本地和全球银河系的属性设置气相金属丰度。我们发现，当地的金属丰度主要取决于？*（解决的质量-金属丰度关系，rMZR），并有一个次要的？关系与？SFR（即空间解决版本的“基本金属丰度？，rFMR）。我们发现，在确定局部金属丰度时，这一点的重要性低于α SFR。这一结果表明，气体吸积，导致局部金属丰度稀释和局部促进星星的形成，是不太可能的rFMR的主要来源。局部金属丰度与星系的整体性质有关。我们发现一个强烈的依赖于总恒星质量（M*）和较弱的（逆）依赖于总SFR。因此，全球金属丰度标度关系并不简单地源于它们的对应关系;全球性质和过程，如全球引力势阱、星系尺度风和全球金属再分配/混合，除了当地的生产和保留外，可能还有助于当地的金属丰度。
We study the scaling relations between gas-phase metallicity, stellar mass surface density (Σ*), star formation rate surface density (ΣSFR), and molecular gas surface density () in local star-forming galaxies on scales of a kpc. We employ optical integral field spectroscopy from the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey, and ALMA data for a subset of MaNGA galaxies. We use partial correlation coefficients and Random Forest regression to determine the relative importance of local and global galactic properties in setting the gas-phase metallicity. We find that the local metallicity depends primarily on Σ*(the resolved mass–metallicity relation, rMZR), and has a secondary anticorrelation with ΣSFR(i.e. a spatially resolved version of the ‘Fundamental Metallicity Relation’, rFMR). We find thatis less important than ΣSFRin determining the local metallicity. This result indicates that gas accretion, resulting in local metallicity dilution and local boosting of star formation, is unlikely to be the primary origin of the rFMR. The local metallicity dependsalsoon the global properties of galaxies. We find a strong dependence on the total stellar mass (M*) and a weaker (inverse) dependence on the total SFR. The global metallicity scaling relations, therefore, do not simply stem out of their resolved counterparts; global properties and processes, such as the global gravitational potential well, galaxy-scale winds and global redistribution/mixing of metals, likely contribute to the local metallicity, in addition to local production and retention.