标题： 基于 PHANGS-MUSE 数据的辉光线金属丰度刻度 显示英文标题

标题： Metallicity calibrations based on auroral lines from PHANGS-MUSE data

摘要： 我们对PHANGS-MUSE星云目录中选定的HII区域进行了化学分析。 我们的目的是通过经验重新校准适用于附近恒星形成星系中广泛金属丰度范围内的气体金属丰度的经验诊断方法。 为了确保可靠测量跃迁线的流量，我们进行了新的光谱拟合程序，其中仅考虑感兴趣发射线周围的限制波长区域：这保证了对恒星连续谱更好的拟合。 没有对星云亮度进行先验削减以限制跃迁线检测中的偏差。 通过直接法估计了O+、O++、N+、S+和S++的离子丰度。 我们将选定的PHANGS-MUSE样本与其他现有的跃迁线目录整合，适当重新分析以获得一致的数据集。 这被用来推导跨越12+log(O/H) = 7.5到8.8的强线诊断校准。 我们研究了它们对电离参数的依赖性，并得出结论认为它可能是这些诊断中观察到显著分散的主要原因。 我们将新校准的强线诊断应用于PHANGS-MUSE星云目录中的所有HII区域，并利用这些间接金属丰度估计来研究样本中19个星系的径向金属丰度梯度。 我们将我们的结果与文献进行比较，发现良好一致性，验证了我们的程序和发现。 在这篇文章中，我们发布了PHANGS-MUSE星云目录中选定HII区域的完整跃迁线和星云线流量目录。 这是第一个使用PHANGS-MUSE数据进行的直接化学丰度测量目录。 显示英文摘要

摘要： We present a chemical analysis of selected HII regions from the PHANGS-MUSE nebular catalogue. Our intent is to empirically re-calibrate strong-line diagnostics of gas-phase metallicity, applicable across a wide range of metallicities within nearby star-forming galaxies. To ensure reliable measurements of auroral line fluxes, we carried out a new spectral fitting procedure whereby only restricted wavelength regions around the emission lines of interest are taken into account: this assures a better fit for the stellar continuum. No prior cuts to nebulae luminosity were applied to limit biases in auroral line detections. Ionic abundances of O+, O++, N+, S+, and S++ were estimated by applying the direct method. We integrated the selected PHANGS-MUSE sample with other existing auroral line catalogues, appropriately re-analysed to obtain a homogeneous dataset. This was used to derive strong-line diagnostic calibrations that span from 12+log(O/H) = 7.5 to 8.8. We investigate their dependence on the ionisation parameter and conclude that it is likely the primary cause of the significant scatter observed in these diagnostics. We apply our newly calibrated strong-line diagnostics to the total sample of HII regions from the PHANGS-MUSE nebular catalogue, and we exploit these indirect metallicity estimates to study the radial metallicity gradient within each of the 19 galaxies of the sample. We compare our results with the literature and find good agreement, validating our procedure and findings. With this paper, we release the full catalogue of auroral and nebular line fluxes for the selected HII regions from the PHANGS-MUSE nebular catalogue. This is the first catalogue of direct chemical abundance measurements carried out with PHANGS-MUSE data.