{
  "abstract": "We present preliminary results of a study of galaxy sizes at redshift $z \\gtrsim 5$ using the high-resolution, zoom-in \\textsc{FirstLight} simulations. We obtain a redshift-independent, chevron-shaped stellar mass--size relation with a peak at $M^{\\star} \\approx 10^{8.5}~\\mathrm{M}_\\odot$. This relation is shaped by the individual evolution of galaxies, which undergo a phase of contraction at this mass scale triggered by a strong central starburst.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.23911",
  "author_total": 5,
  "authors": [
    {
      "name": "P. Cataldi"
    },
    {
      "name": "S. Pedrosa"
    },
    {
      "name": "L. J. Pellizza"
    },
    {
      "name": "D. Ceverino"
    },
    {
      "name": "L. A. Bignone"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/cxnd70wcxd4y0.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.23911",
  "fulltext_url": null,
  "id": "cxnd70wcxd4y0",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.23911",
  "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": "W7214056968",
  "pdf_url": "https://arxiv.org/pdf/2609.23911",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-20",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/cxnd70wcxd4y0.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:19Z",
      "native_id": "2609.23911",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.23911"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "Galaxy sizes in the early Universe",
  "title_text": "Galaxy sizes in the early Universe",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:19Z",
  "url": "https://research.draconitic.com/paper/cxnd70wcxd4y0",
  "venue": "arXiv",
  "versions": []
}