Relatore
Descrizione
The James Webb Space Telescope has fulfilled its long-awaited promises, opening an entirely new window to constrain star-formation, metal and dust enrichment, and feedback processes in some of the earliest galaxies ever formed. A key driver of this progress is the JWST capability to deliver auroral-line detections out to high redshift, enabling increasingly robust, physically motivated electron-temperature (Te)-based metallicity measurements beyond the local Universe.
Yet the emerging picture remains complex. Several studies point to rapid chemical enrichment and an increased scatter in metallicity scaling relations--potentially reflecting more stochastic star-formation and feedback--while compelling candidates for (nearly) pristine, extremely metal-poor systems have also been reported.
In parallel, growing evidence for non-solar abundance patterns (e.g. elevated N/O at low O/H) suggests variations in star-formation efficiency and/or short-timescale enrichment channels, possibly linked to very massive stars.
I will present some recent developments in the study of detailed chemical abundances in high-z galaxies that leverage deep, both MSA and IFS NIRSpec spectroscopy in combination with novel, multi-cloud photoionisation modeling. I will also discuss how the evolution in the metallicity-dependence of star-formation and the prevalence of non-solar abundance patterns across the cosmic history can influence our understanding of stellar evolution and the predicted rates of phenomena linked to metal-poor progenitors.
Finally, I will discuss future prospects in light of forthcoming large spectroscopic surveys (e.g. MOONS, 4MOST) and next-generation ground-based (ELT) and space-based (e.g. PRIMA) facilities.
| Sessione | Evoluzione delle galassie |
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