利用自洽金属度定标重新评估已分辨的质量-金属度关系
Re-evaluating the resolved mass-metallicity relation with a self-consistent metallicity calibration
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中文总结 AI 辅助
该研究基于SDSS-IV/MaNGA数据，采用自洽金属度定标重新评估质量-金属度关系，发现恒星形成率与金属度无显著相关性，支持流入流出平衡的星系演化图景。
中文摘要 AI 辅助
目标：质量-金属度关系（MZR）对于理解星系的化学演化至关重要。恒星形成率（SFR）是否在金属度的确定中发挥作用长期以来一直存在争议。使用不同的金属度定标会导致这一基础但尚未解决的问题得出不同的结论。方法：我们应用基于光电离模型的自洽金属度定标来重新评估已分辨和积分的MZR。我们利用SDSS-IV/MaNGA的积分场单元数据，包含约3.5×10^6个空间像素和约4550个星系。我们将我们优选的金属度定标与文献中的几条强线定标以及直接法金属度进行比较。我们分析MZR的金属度残差以评估SFR的影响，并应用偏相关系数来量化这些影响。结果：我们使用的金属度定标与直接法显示出最佳一致性。我们提供3个已分辨MZR的方程，并验证本地SFR与金属度没有显著相关性。考虑积分性质时，（s）SFR与金属度残差不存在相关性。结果表明，流入和流出的平衡是更受青睐的，且质量-金属度关系对SFR没有次要依赖性。
英文摘要
Aims. The mass-metallicity relation (MZR) is essential for understanding the chemical evolution of galaxies. Whether the star formation rate (SFR) plays a role in setting the metallicity has long been debated. Using various metallicity calibrations can result in different conclusions for this fundamental yet unresolved issue. Methods. We apply a self-consistent metallicity calibration based on photoionization models to re-evaluate the resolved and integrated MZR. We utilize the integral field unit data from SDSS-IV/MaNGA, with $\sim 3.5\times10^6$ spaxels and $\sim$ 4550 galaxies. We compare our preferred metallicity calibration with several strong-line calibrations in the literature and direct method metallicity. We analyze the metallicity residual of MZR to evaluate the effects of SFR and apply the partial correlation coefficient to quantify the effects. Results. The metallicity calibration we used shows the best consistency with the direct method. We provide 3 equations for resolved MZR, and verify that local SFR does not show significant correlation with metallicity. Considering the integrated properties, (s)SFR do not present correlation with the metallicity residuals. The results suggest that an equilibrium of inflow and outflow is favored, and the mass-metallicity relation does not have a secondary dependence on SFR.
