AI 中文总结
该研究基于SDSS-IV MaNGA数据，探究低红移星系恒星形成停止的淬灭判据影响，发现可靠淬灭区域的特征重要性与淬灭定义无关，AGN相关过程仅影响潜在淬灭区域，且主导参数随恒星质量变化。
AI 中文摘要
本文是研究千秒差距尺度附近星系恒星形成停止的系列论文中的第三篇。利用最终的SDSS-IV MaNGA数据发布，我们探究全局、局部及环境属性的推断重要性如何取决于淬灭区域的操作定义。我们通过考虑测量不确定性，将空间像素（spaxel）分类为恒星形成、可靠淬灭或潜在淬灭，并使用一组参数训练随机森林分类器，该参数集旨在与过往研究进行直接比较。对于可靠淬灭区域，局部恒星质量面密度Σ_*始终具有最高的特征重要性，且与淬灭定义无关。相比之下，中心速度弥散σ_c的高重要性（此前被解释为全星系AGN反馈的证据）主要在包含潜在淬灭区域时才会被恢复。主导参数还随恒星质量变化：在~10^10.2 M_⊙以下，Σ_1kpc最为重要；而在高质量端，Σ_*和σ_*等局部量则更为突出。这些结果表明，淬灭判据和不确定性处理可协调看似矛盾的特征重要性研究。AGN相关过程可能对模糊区域有贡献，但可靠淬灭群体与高局部恒星密度的关联最为紧密。
英文摘要
This paper is the third in a series of studies investigating star formation cessation in nearby galaxies on kiloparsec scales. Using the final SDSS-IV MaNGA data release, we ask how the inferred importance of global, local, and environmental properties depends on the operational definition of quenched regions. We classify spaxels as star-forming, reliably quenched, or potentially quenched by accounting for measurement uncertainties, and train random forest classifiers with a parameter set chosen for direct comparison with previous work. For reliably quenched regions, the local stellar mass surface density $Σ_\ast$ consistently has the highest feature importance, independent of quenching definition. By contrast, the high importance of central velocity dispersion $σ_c$, previously interpreted as evidence for galaxy-wide AGN feedback, is recovered mainly when potentially quenched regions are included. The leading parameter also varies with stellar mass: $Σ_{\rm 1kpc}$ is most important below $\sim10^{10.2}\,\textrm{M}_{\odot}$, whereas local quantities such as $Σ_\ast$ and $σ_\ast$ become more prominent at high masses. These results show that quenching criteria and uncertainty treatment can reconcile apparently discrepant feature-importance studies. AGN-related processes may contribute to ambiguous regions, but the reliably quenched population is most tightly linked to high local stellar density.
Comments13 pages, 9 figures, submitted to ApJ
