New empirical metallicity relations for the local and high-redshift universe derived from DESIRED, the largest catalogue of high-quality Te-based dataRecording
by
00.303.0 - Aula 13
Facultad de Ciencias Físicas
We present a new set of strong-line metallicity calibrations based on the most extensive and high-quality compilation of Te-based abundances to date—over 2000 star-forming galaxies and HII regions with optical auroral line measurements. Unlike previous calibrations derived from a limited dataset, our work fully accounts for observational uncertainties and temperature inhomogeneities, addressing the well-known abundance discrepancy. By incorporating the highest-quality spectroscopic data, we refine empirical metallicity indicators with unprecedented statistical robustness and parameter space coverage. We further explore the impact of the ionization parameter and N/O abundance dependence on these calibrations. Our results reveal that traditional strong-line methods systematically underestimate metallicities. These findings are critical for accurately tracing the chemical evolution of the Universe and reconciling empirical datasets with theoretical models of massive star formation and feedback across cosmic time.