{
  "abstract": "We present deep, $>10$ hr, JWST NIRSpec G140M and G395M observations of a previously known galaxy C3PO-8447 at $z=8.99781$. Our new NIRSpec data from the Carbon-3 plus Oxygen (C3PO) survey detect Ly$α$ emission with an escape fraction of $1.5\\pm0.3\\%$ and a velocity offset of $210\\pm80$ km s$^{-1}$, making C3PO-8447 the third Ly$α$ emitting galaxy confirmed at $z\\gtrsim 9$. The galaxy has a low stellar mass of $2.2\\pm0.1\\times 10^7\\ M_\\odot$, a young stellar age of $1.6\\pm0.2$ Myr, and a low oxygen abundance of $12+\\log(\\mathrm{O/H}) = 7.50\\pm0.08$. UV diagnostic diagrams incorporating the C IV, O III], and C III] emission lines indicate that the ionization of C3PO-8447 is dominated by the recent starburst. The low Ly$α$ escape fraction of C3PO-8447 implies that C3PO-8447 resides in a small ionized bubble with radius $R \\sim 0.07$ to 0.20 pMpc, which can be produced by C3PO-8447 alone. We find no evidence for either a large-scale galaxy overdensity around C3PO-8447 or a significant contribution from nearby galaxies to its ionizing photon budget. Taken together, these results suggest that C3PO-8447 likely represents an ionized bubble powered by a single low-mass, vigorously star-forming galaxy during the early stages of cosmic reionization.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.03608",
  "author_total": 9,
  "authors": [
    {
      "name": "Weida Hu"
    },
    {
      "name": "Casey Papovich"
    },
    {
      "name": "Taylor A. Hutchison"
    },
    {
      "name": "Rebecca L. Larson"
    },
    {
      "name": "Pablo Arrabal Haro"
    },
    {
      "name": "Steven L. Finkelstein"
    },
    {
      "name": "Nikko J. Cleri"
    },
    {
      "name": "Lu Shen"
    },
    {
      "name": "Jiayang Yang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/4na9mrqd1t01x.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.03608",
  "fulltext_url": null,
  "id": "4na9mrqd1t01x",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.03608",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.GA"
    ],
    [
      "openalex",
      "3103|Galaxies: Formation, Evolution, Phenomena"
    ]
  ],
  "openalex": "W7208774119",
  "pdf_url": "https://arxiv.org/pdf/2609.03608",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-03",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/4na9mrqd1t01x.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:31Z",
      "native_id": "2609.03608",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.03608"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "C3PO: A Lyα Emitting Galaxy at $z \\sim 9$",
  "title_text": "C3PO: A Lyα Emitting Galaxy at z ∼ 9",
  "type": "preprint",
  "updated_at": "2026-10-30T12:18:31Z",
  "url": "https://research.draconitic.com/paper/4na9mrqd1t01x",
  "venue": "arXiv",
  "versions": []
}