Shape of the direct-method mass-metallicity relation with JWST: Fast-Track Nitrogen and Helium Enrichment
The study investigated how star-formation history and auroral-line selection affect the low-mass high-redshift mass-metallicity relation using JWST data. Detections of strong auroral lines trace systems with high star formation and low metallicity, while non-detections reveal a more enriched sequence. This suggests the MZR is composed of distinct populations shaped by recent bursts and gas accretion.