N/O
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- https://arxiv.org/abs/1911.00581
- N/O ratio of 0.46 in GS 3073 at redshift z= 5.55：w can be produced by 1000 - 10,000 M⊙ primordial (Pop III) stars. [1]
- All nitrogen-enhanced galaxies have moderate to high gas pressure () and high ionization parameter (), indicating a dense and compact environment. We suggest that super star clusters containing Wolf-Rayet stars and massive stars are the most likely contributors to the elevated nitrogen abundance in these galaxies. arXiv:2512.04043