{
  "abstract": "We investigate the internal structure of two galaxies from the LEWIS sample: the ultra-diffuse galaxy UDG-1 and the extended dwarf LSB-6. Both show coherent stellar rotation combined with a non-negligible fraction of random motion, with no signs of ongoing disturbance. This is the first attempt to constrain the dynamics and dark matter physics of rotation-supported UDGs through integral-field stellar kinematics. We model the galaxies as stellar spheroids with typical dwarf-like thickness embedded in spherical dark matter halos, deriving two-dimensional velocity fields that we compare with the observations in a Bayesian framework. Besides cold dark matter, we test fuzzy, self-interacting, and non-minimally coupled dark matter. The data prefer a cuspy halo in UDG-1 and a cuspless one in LSB-6. All the alternative models remain viable, although current data cannot conclusively discriminate among them. For fuzzy dark matter we obtain mutually consistent boson masses, $m_α= 4.7^{+1.8}_{-1.1} \\times 10^{-22}$ eV for UDG-1 and $m_α= 6.3^{+0.4}_{-0.4} \\times 10^{-22}$ eV for LSB-6. For self-interacting dark matter, LSB-6 yields a robust constraint on the velocity-weighted cross section, $\\langle σv\\rangle/m = 14.3^{+2.0}_{-1.9}$ cm$^2$ km g$^{-1}$ s$^{-1}$. For non-minimally coupled dark matter we derive upper bounds on the coupling length, implying marginal deviations from $Λ$CDM. Regardless of the model, both galaxies exhibit a dark matter content comparable with halos of typical dwarf galaxies with similar stellar masses. Together with stellar population analyses and globular cluster information, these results support a scenario in which UDG-1 and LSB-6 originate from puffed-up dwarfs. This work is the first in a series exploiting kinematic data of extremely low-surface-brightness galaxies to test fundamental physics, from dark matter to modified theories of gravity.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: F. Bouchè et al., Probing the dynamics of extreme galaxies I. Dark matter content in ultra-diffuse galaxies, Astron. Astrophys. 715, A38 (2026)",
  "arxiv": "2609.10700",
  "author_total": 9,
  "authors": [
    {
      "name": "Filippo Bouchè"
    },
    {
      "name": "Chiara Buttitta"
    },
    {
      "name": "Saboura Zamani"
    },
    {
      "name": "Enrichetta Iodice"
    },
    {
      "name": "Salvatore Capozziello"
    },
    {
      "name": "Vincenzo Salzano"
    },
    {
      "name": "Marcello Miranda"
    },
    {
      "name": "Enrico Maria Corsini"
    },
    {
      "name": "Marco Mirabile"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/3q8mse78j5at4.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.10700",
  "fulltext_url": null,
  "id": "3q8mse78j5at4",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.10700",
  "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.CO"
    ],
    [
      "arxiv",
      "astro-ph.GA"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2609.10700",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-09",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/3q8mse78j5at4.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:20:26Z",
      "native_id": "2609.10700",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.10700"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "Probing dynamics of extreme galaxies I. Dark matter content in ultra-diffuse galaxies",
  "title_text": "Probing dynamics of extreme galaxies I. Dark matter content in ultra-diffuse galaxies",
  "type": "preprint",
  "updated_at": "2026-11-09T00:20:14Z",
  "url": "https://research.draconitic.com/paper/3q8mse78j5at4",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1051/0004-6361/202659788",
      "pid": "abay2rtfg3nk7",
      "relation": "published-as",
      "title": "Probing the dynamics of extreme galaxies. I. Dark matter content in ultra-diffuse galaxies",
      "venue": "Astronomy & Astrophysics"
    }
  ]
}