{
  "abstract": "We report the possible detection of a Dark Galaxy Candidate (DGC; AGC 322753), via the cross-matching of the Arecibo Legacy Fast ALFA (ALFALFA) and the FAST All Sky HI (FASHI) HI blind surveys. It is detected by both surveys at the same recessional velocity, with a comparable HI mass of $2\\times10^{9}$ M$_\\odot$, and with similar HI spectral features. The ALFALFA and FASHI spectra show a double-peaked profile, compatible with a disc-like ordered rotation, and an HI linewidth at 50 per cent of the peak ($W_{50}$) of $\\sim$85 km s$^{-1}$. The common intersection of the two beams allows the source position to be constrained with much greater precision than in either survey individually. Being detected by both radio telescopes, a Radio Frequency Interference (RFI) origin is excluded. No evidence of an optical counterpart was found down to $\\sim$27.5 mag arcsec$^{-2}$ in the DESI Legacy Imaging Surveys, which leads to a stellar mass limit of $M_\\star \\lesssim 5\\times10^{7}$ M$_\\odot$. Given this stellar mass limit, AGC 322753 has $M_{\\rm HI}/M_\\star \\gtrsim 40$. The HI mass is higher than expected for totally starless haloes; this could imply that AGC 322753 is not completely 'dark' but could host a luminous counterpart below the current optical detection limit.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.39152",
  "author_total": 4,
  "authors": [
    {
      "name": "Marco Monaci"
    },
    {
      "name": "Duncan A. Forbes"
    },
    {
      "name": "Warrick J. Couch"
    },
    {
      "name": "Jean P. Brodie"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/erg1cwr3n1rsd.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.39152",
  "fulltext_url": null,
  "id": "erg1cwr3n1rsd",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.39152",
  "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": null,
  "pdf_url": "https://arxiv.org/pdf/2609.39152",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-30",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/erg1cwr3n1rsd.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:49Z",
      "native_id": "2609.39152",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.39152"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "AGC 322753: a Dark Galaxy Candidate detected by ALFALFA and FASHI",
  "title_text": "AGC 322753: a Dark Galaxy Candidate detected by ALFALFA and FASHI",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:49Z",
  "url": "https://research.draconitic.com/paper/erg1cwr3n1rsd",
  "venue": "arXiv",
  "versions": []
}