{
  "abstract": "We report the discovery of J1351+0039, a new isolated dark galaxy candidate identified through a blind HI survey with the Five-hundred-meter Aperture Spherical radio Telescope (FAST), combined with deep optical imaging from the DESI Legacy Survey. The object displays a compact HI structure with a systemic velocity of V_{LSR} = 429.0 \\kms and an inferred HI mass of 4.5*10^5 Msun at a distance of 3.6 Mpc. No optical counterpart is detected in the DESI images, with a g-band surface brightness limit of 28.1 mag arcsec^{-2}, corresponding to a stellar mass limit of M_{star} of 1.2*10^{5} Msun. The dynamical mass is estimated to be M_{dyn} of 1.3*10^{8} Msun, yielding a dark-to-baryonic mass ratio of 200, implying that J1351+0039 is overwhelmingly dominated by dark matter. While weak rotation is detected in J1351+0039, the kinematics are dominated by internal velocity dispersion, confirming pressure support and reminiscent of Reionization-Limited HI Clouds (RELHICs). J1351+0039 stands out as one of the most promising isolated RELHIC candidates, offering a unique laboratory for studying baryonic physics and dark matter in the absence of star formation.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.29852",
  "author_total": 9,
  "authors": [
    {
      "name": "Jin-Long Xu"
    },
    {
      "name": "Alejandro Benitez-Llambay"
    },
    {
      "name": "Ming Zhu"
    },
    {
      "name": "Chuan-Peng Zhang"
    },
    {
      "name": "Nai-Ping Yu"
    },
    {
      "name": "Xiao-Lan Liu"
    },
    {
      "name": "Mei Ai"
    },
    {
      "name": "Ruilei Zhou"
    },
    {
      "name": "Bin Liu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/4q1k5s57x8kwb.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.29852",
  "fulltext_url": null,
  "id": "4q1k5s57x8kwb",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.29852",
  "language": null,
  "licence": "CC-BY-NC-SA-4.0",
  "licence_label": "CC BY-NC-SA 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-nc-sa/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.CO"
    ],
    [
      "arxiv",
      "astro-ph.GA"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2609.29852",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-21",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/4q1k5s57x8kwb.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:34:18Z",
      "native_id": "2609.29852",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.29852"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "Discovery of an isolated RELHIC Candidate: J1351+0039",
  "title_text": "Discovery of an isolated RELHIC Candidate: J1351+0039",
  "type": "preprint",
  "updated_at": "2026-10-30T12:34:18Z",
  "url": "https://research.draconitic.com/paper/4q1k5s57x8kwb",
  "venue": "arXiv",
  "versions": []
}