Speaker
Description
A slew of results from JWST spectroscopy have allowed us to start constraining the chemistry of galaxies over the vast majority of cosmic time. Rest-frame optical NIRSpec spectroscopy has provided the community with a large sample of galaxies with strong emission lines. Simultaneously, a number of programmes has provided deep spectroscopy resulting in a few dozen galaxies with detections of crucial faint emission lines such as [OIII]4363 (e.g. Curti+2023, Nakajima+2023, +), which allow us to robustly constrain chemical abundances using the Te-method.
Simultaneously, the DESI survey is building up the largest catalogue of galaxy spectra in the nearby Universe to date. DESI probes significantly lower-mass and fainter galaxies than previous generations of large spectroscopic surveys (see e.g. Scholte+2024). This year, we will have access to samples of tens of thousands galaxies with [OIII]4363 detections which is an order of magnitude increase over the current number.
I will show results where we present newly detected high-z [OIII]4363 galaxies (2 < z < 8) observed as part of the JWST EXCELS survey, which provides some of the deepest JWST spectroscopy currently available. We combine these measurements with the new sample of local Te-abundances obtained from DESI. These results show (1) the great success of recent improvements of strong line metallicity calibrations, (2) chemical enrichment of multiple elements in the early Universe, and (3) the path ahead with these new data in the nearby and high-z Universe.
