Temperature based radial metallicity gradients in nearby galaxies

TL;DR

This study demonstrates that the [NII]5755 auroral line can reliably trace metallicity gradients in nearby spiral galaxies, confirming a well-mixed interstellar medium and validating strong line calibration methods.

Contribution

It introduces a large catalog analysis showing the effectiveness of using only the [NII]5755 line for metallicity measurements in galaxies.

Findings

Good agreement between stacked and individual region gradients

Low scatter indicating well-mixed ISM in many galaxies

No significant metallicity difference between arm and interarm regions

Abstract

Gas-phase abundances provide insights into the baryon cycle, with radial gradients and 2D metallicity distributions tracking how metals build up and redistribute within galaxy disks over cosmic time. We use a catalog of 22,958 HII regions across 19 nearby spiral galaxies to examine how precisely the radial abundance gradients can be traced using only the [NII]5755 electron temperature as a proxy for `direct method' metallicities. Using 534 direct detections of the temperature sensitive [NII]5755 auroral line, we measure gradients in 15 of the galaxies. Leveraging our large catalog of individual HII regions, we stack in bins of HII region [NII]6583 luminosity and radius to recover stacked radial gradients. We find good agreement between the metallicity gradients from the stacked spectra, those gradients from individual regions and those from strong line methods. In addition, particularly in the stacked Te([NII]) measurements, some galaxies show very low (<0.05 dex) scatter in metallicities, indicative of a well-mixed ISM. We examine individual high confidence (S/N > 5) outliers and identify 13 regions across 9 galaxies with anomalously low metallicity, although this is not strongly reflected in the strong line method metallicities. By stacking arm and interarm regions, we find no systematic evidence for offsets in metallicity between these environments, suggesting enrichment within spiral arms is due to very localized processes. This work demonstrates the potential to systematically exploit the single [NII]5755 auroral line for detailed gas-phase abundance studies of galaxies. It provides strong validation of previous results, based on the strong line calibrations, of a well-mixed ISM across typical star-forming spiral galaxies.