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Characterising Nitrogen-Rich Galaxies at z>6

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If you have a question about this talk, please contact Charles Walker .

The discovery of an unexpectedly high nitrogen-to-oxygen (N/O) ratio in a z=10.6 galaxy GN-z11 presents new challenges to our understanding of star formation in the early universe. By analysing publicly available NIR Spec data, we have identified two additional galaxies at redshifts z=6.23-8.68 exhibiting supersolar N/O ratios, significantly exceeding those of local galaxies with similar metallicities. We emphasise that these nitrogen enrichment is also relative to carbon, suggesting a predominance of material processed through the CNO cycle. This talk will also review approximately ten galaxies at z>6 now reported to have supersolar N/O ratios, examining shared characteristics that may elucidate the origins of this distinct nitrogen enrichment and propose connections to hard ionising sources, dense gas, and globular cluster formation.

This talk is part of the Hills Coffee Talks series.

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