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Multiple channels for nitrogen pollution by metal enriched supermassive stars and implications for GN-z11
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GN-z11 is an unusually luminous high redshift galaxy which was recently observed to have strong nitrogen lines while at the same time lacking traditional signatures of AGN activity. These observations have been interpreted as a super-solar nitrogen abundance which is challenging to explain with standard stellar evolution and supernovae enrichment. We present simulations of four models of metal enriched supermassive stars after the zero age main sequence which produce super-solar nitrogen consistent with the observations of GN-z11. We then show that the most massive model ends its life in a violent explosion which results in even greater nitrogen pollution.
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Cited by 3 Pith papers
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SPURS: Massive Stars, Dense Gas, and Ly$\alpha$ Escape in GN-z11 at $z = 10.6$
GN-z11's rest-UV spectrum shows young massive stars with very massive star winds, dense gas, and a broad red Ly alpha wing that may help Ly alpha escape the largely neutral early universe.
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Unveiling and Characterising Ubiquitous Nitrogen Enhancement in $6 \leq z \leq 10$ Galaxies with JWST Spectroscopy
Stacked JWST/NIRSpec spectra of 135 z=6-10 galaxies show supersolar N/O that is highest after a star-formation lull, consistent with delayed AGB enrichment and pristine gas inflows.
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Bright Galaxies at Cosmic Dawn: A Cloud-Scale Star Formation Model Unifying Variable SFE, IMFs, and Stochasticity
A cloud-based semi-analytic model shows that a top-heavy stellar initial mass function and a cloud-property-dependent star-formation efficiency, rather than cloud mass or density, most strongly shape the UV luminosity...
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