76 N/O-enhanced galaxies at 4<z<8.5 are observed shortly after starbursts, either in the WR enrichment phase within 10 Myr or the AGB phase after 30-40 Myr following outflows.
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4 Pith papers cite this work. Polarity classification is still indexing.
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astro-ph.GA 4representative citing papers
Galaxies at z>1 show N/O ratios elevated by a median 0.18 dex at fixed O/H relative to local trends, reaching 0.4-0.5 dex at low metallicity.
New empirical calibrations between 19 emission-line ratios and oxygen abundance are derived from direct electron-temperature measurements in 139 star-forming galaxies at z=1.4-10.6.
Abundance analysis of 84 type-2 AGNs finds oversolar He and subsolar O at z>2.8, including one object at z=6.26 with record He abundance of 12+log(He/H)=11.64, plus marginal trends of declining He/H and rising O/H toward z=0.
citing papers explorer
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Tracing nitrogen enrichment across cosmic time with JWST
Galaxies at z>1 show N/O ratios elevated by a median 0.18 dex at fixed O/H relative to local trends, reaching 0.4-0.5 dex at low metallicity.