A z=4.69 galaxy shows elevated N/O at low metallicity, best explained by massive Wolf-Rayet stars that collapse directly to black holes and enrich the gas with nitrogen before any supernova oxygen.
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Potential Nitrogen Enrichment via Direct-Collapse Wolf-Rayet Stars in a $z=4.7$ Star-Forming Galaxy
A z=4.69 galaxy shows elevated N/O at low metallicity, best explained by massive Wolf-Rayet stars that collapse directly to black holes and enrich the gas with nitrogen before any supernova oxygen.