{
  "abstract": "When Population III (Pop III) star formation ended remains an open question. LATED-1 is an intrinsically faint ($M_\\mathrm{UV}=-16.15$) Ly$α$ emitter at $z=4.80$ revealed by VLT/MUSE behind the lensing cluster Abell 2744 ($z=0.308$). Before any spectroscopic metallicity constraints, it was identified as an extremely metal-poor or metal-free galaxy candidate from JWST imaging by LATED, our novel photometric selection framework. Here we present serendipitous JWST/NIRSpec PRISM integral-field spectroscopy of this target. The spectrum reveals Ly$α$, H$β$, and H$α$ at 7.0, 5.6, and 17.7$σ$, as well as tentative detections of [O III]$λ\\lambda4959,5007$ at 2.9$σ$, and yields $R3=\\mathrm{[O\\,III]\\lambda5007/Hβ}=0.59^{+0.27}_{-0.21}$, upholding the earlier LATED photometric prediction of $R3<1.54$ ($2σ$ limit). The canonical JWST-based strong-line calibration, extrapolated to low metallicity, implies $\\log (O/H)=6.45^{+0.17}_{-0.19}$, or $Z/Z_\\odot=0.58_{-0.20}^{+0.28}\\%$, placing LATED-1 among the most metal-poor galaxies known. Its modest magnification ($μ=2.80$) leaves the intrinsic properties insensitive to the lens model. LATED-1 is therefore a dwarf galaxy caught in the earliest state of chemical enrichment, and a compelling target for testing whether Pop III star formation can persist to $z<5$. The result demonstrates that photometric selection, especially through the LATED methodology, can reach below one per cent solar metallicity to identify Pop III galaxy candidates for spectroscopic follow-up.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.24589",
  "author_total": 29,
  "authors": [
    {
      "name": "Mingyu Li"
    },
    {
      "name": "Roberto Maiolino"
    },
    {
      "name": "Zheng Cai"
    },
    {
      "name": "Hannah Übler"
    },
    {
      "name": "Boyuan Liu"
    },
    {
      "name": "Qiao Duan"
    },
    {
      "name": "Fuyan Bian"
    },
    {
      "name": "Sijia Cai"
    },
    {
      "name": "Francesco D'Eugenio"
    },
    {
      "name": "Eiichi Egami"
    },
    {
      "name": "Bjorn H. C. Emonts"
    },
    {
      "name": "Xiaohui Fan"
    },
    {
      "name": "Yuki Isobe"
    },
    {
      "name": "Lucy R. Ivey"
    },
    {
      "name": "Xihan Ji"
    },
    {
      "name": "Gareth C. Jones"
    },
    {
      "name": "Maria Koller"
    },
    {
      "name": "Xiaojing Lin"
    },
    {
      "name": "Christopher C. Lovell"
    },
    {
      "name": "Kimihiko Nakajima"
    },
    {
      "name": "Masami Ouchi"
    },
    {
      "name": "Robert G. Pascalau"
    },
    {
      "name": "J. Xavier Prochaska"
    },
    {
      "name": "Jan Scholtz"
    },
    {
      "name": "Fengwu Sun"
    },
    {
      "name": "Sandro Tacchella"
    },
    {
      "name": "Yunjing Wu"
    },
    {
      "name": "Fujiang Yu"
    },
    {
      "name": "Zijian Zhang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/09smbwxes6wge.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.24589",
  "fulltext_url": null,
  "id": "09smbwxes6wge",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.24589",
  "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.CO"
    ],
    [
      "arxiv",
      "astro-ph.GA"
    ],
    [
      "arxiv",
      "astro-ph.SR"
    ],
    [
      "openalex",
      "3103|Galaxies: Formation, Evolution, Phenomena"
    ]
  ],
  "openalex": "W7214013776",
  "pdf_url": "https://arxiv.org/pdf/2609.24589",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-21",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/09smbwxes6wge.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:19Z",
      "native_id": "2609.24589",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.24589"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.SR",
      "subfield": "stellar"
    }
  ],
  "title": "LATED: JWST integral field spectroscopy of a galaxy caught in chemical infancy at $z=4.8$ behind Abell 2744",
  "title_text": "LATED: JWST integral field spectroscopy of a galaxy caught in chemical infancy at z=4.8 behind Abell 2744",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:19Z",
  "url": "https://research.draconitic.com/paper/09smbwxes6wge",
  "venue": "arXiv",
  "versions": []
}