New KCWI spectroscopy of two ultra-low-metallicity galaxies shows Fe/O ratios near solar, implying enrichment by bright hypernovae or pair-instability supernovae.
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The Mysterious Case of Iron in XMPs: Anomalous High log(Fe/O) Observed in Extremely Metal-Poor Galaxies HSCJ1631+4426 and SDSSJ0811+4730
New KCWI spectroscopy of two ultra-low-metallicity galaxies shows Fe/O ratios near solar, implying enrichment by bright hypernovae or pair-instability supernovae.