{
  "abstract": "We present ultra-deep JWST/NIRSpec $R\\sim1000$ spectroscopy of nine star-forming galaxies at $z=6.0-8.3$ in the GOODS-N field, drawn from the Origins of Metal Enrichment in Galaxies at cosmic dAwn (OMEGA) survey. Paired with ancillary ultra-deep G140M observations, the G395M integrations from OMEGA yield continuous rest-frame UV-to-optical coverage and the full suite of diagnostics needed for precise characterisations and measures of the chemical abundances of these systems. Crucially, the auroral [O\\,{\\scriptsize III}]\\,$λ$4363 line is detected in every galaxy, enabling the determination of electron temperatures and direct oxygen abundances of $12+\\log(\\mathrm{O/H})=7.14-8.18$, independent of strong-line calibrations that dominate systematics at these redshifts. We couple direct oxygen abundances with measurements of rest-frame UV emission-line strengths and ratios to infer the physical properties of our sample. Most importantly, we trace the relationship between oxygen abundance and both C/O and N/O abundance ratios with high fidelity, demonstrating robustly that $z=6.0-8.3$ galaxies follow the local trend in C/O vs. O/H, and that inferences regarding N/O are sensitive to the choice of rest-frame UV (\\niv] or \\niii]) or optical ([\\nii]) tracers. This pilot study demonstrates the power of combining ultra-deep JWST/NIRSpec $R\\sim1000$ rest-frame UV and optical spectroscopy, which now requires statistical samples to uncover the nebular properties of the full population of $z\\geq 6$ star-forming galaxies.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.35526",
  "author_total": 11,
  "authors": [
    {
      "name": "Raunaq Singh Rai"
    },
    {
      "name": "Guido Roberts-Borsani"
    },
    {
      "name": "Ryan Sanders"
    },
    {
      "name": "Alice E. Shapley"
    },
    {
      "name": "Leonardo Clarke"
    },
    {
      "name": "Pascal A. Oesch"
    },
    {
      "name": "Daniel Schaerer"
    },
    {
      "name": "Rui Marques-Chaves"
    },
    {
      "name": "Romain A. Meyer"
    },
    {
      "name": "Emma Giovinazzo"
    },
    {
      "name": "Shreya Karthikeyan"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/fsw7fgfwfb09z.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.35526",
  "fulltext_url": null,
  "id": "fsw7fgfwfb09z",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.35526",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.GA"
    ],
    [
      "openalex",
      "3103|Galaxies: Formation, Evolution, Phenomena"
    ]
  ],
  "openalex": "W7214736081",
  "pdf_url": "https://arxiv.org/pdf/2609.35526",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-28",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/fsw7fgfwfb09z.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:12Z",
      "native_id": "2609.35526",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.35526"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "Precise C-N-O Abundances of Individual Galaxies in the First Billion Years from Ultra-Deep, Rest-UV-to-Optical JWST Spectroscopy",
  "title_text": "Precise C-N-O Abundances of Individual Galaxies in the First Billion Years from Ultra-Deep, Rest-UV-to-Optical JWST Spectroscopy",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:12Z",
  "url": "https://research.draconitic.com/paper/fsw7fgfwfb09z",
  "venue": "arXiv",
  "versions": []
}