A new neon-plus-oxygen line ratio, RNe, is introduced and validated as a largely redshift-independent metallicity diagnostic for JWST/NIRSpec out to z~11.2.
Element Abundances in Nearby Galaxies
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abstract
In these lectures I present a highly opinionated review of the observed patterns of metallicity and element abundance ratios in nearby spiral, irregular, and dwarf elliptical galaxies, with connection to a number of astrophysical issues associated with chemical evolution. I also discuss some of the observational and theoretical issues associated with measuring abundances in H II regions and gas and stellar surface densities in disk galaxies. Finally, I will outline a few open questions that deserve attention in future investigations.
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astro-ph.GA 1years
2025 1verdicts
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The JWST EXCELS survey: Probing strong-line diagnostics and the chemical evolution of galaxies over cosmic time using Te-metallicities
A new neon-plus-oxygen line ratio, RNe, is introduced and validated as a largely redshift-independent metallicity diagnostic for JWST/NIRSpec out to z~11.2.