Direct electron-temperature measurements for about 50,000 star-forming galaxies from DESI DR2 yield the largest direct-method abundance catalogue ever built, two record-low-metallicity galaxies, and new trends in N/O, Ne/O, S/O and Ar/O.
Measuring Chemical Abundances in Extragalactic Metal-Rich HII Regions
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abstract
The analysis of metal-rich HII regions has a profound impact on the calibration of abundance diagnostics widely used to measure the chemical content of star-forming galaxies, both locally and at high redshift. I review the main difficulties that affect direct abundance determinations from temperature-sensitive collisionally excited lines, and briefly discuss strong-line methods, in particular their empirical calibration. In the near future it will be possible to calibrate strong-line methods using metal recombination lines, providing abundances that are virtually insensitive to uncertainties on the nebular temperature structure.
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Electron temperature relations and the direct N, O, Ne, S and Ar abundances of 49959 star-forming galaxies in DESI Data Release 2
Direct electron-temperature measurements for about 50,000 star-forming galaxies from DESI DR2 yield the largest direct-method abundance catalogue ever built, two record-low-metallicity galaxies, and new trends in N/O, Ne/O, S/O and Ar/O.