{
  "abstract": "Galaxy asymmetry is an efficient way to characterize galaxy morphology in atomic hydrogen 21 cm emission detections. We propose a novel Bayesian approach to calculate the probability of an underlying squared differences asymmetry in a noisy detection. This approach has a number of advantages, including the recovery of low asymmetry values where prior noise corrections failed. More importantly, our approach provides robust uncertainties on the asymmetry, enabling a wide variety of statistical studies of galaxy populations. This method is generalized for convolved noise measures. We validate our method using a convergence test. Finally, we show how, when applied to the untargeted HI survey WALLABY, our method nearly triples the number of reliable measurements relatively to the previous state-of-the-art technique. This Bayesian approach to measure asymmetry will therefore further unlock the statistical power of widefield galaxy surveys.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.26472",
  "author_total": 5,
  "authors": [
    {
      "name": "Mathieu Perron-Cormier"
    },
    {
      "name": "Kristine Spekkens"
    },
    {
      "name": "Nathan Deg"
    },
    {
      "name": "Lawrence M. Widrow"
    },
    {
      "name": "Marcin Glowacki"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/c4prvkmhexerx.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.26472",
  "fulltext_url": null,
  "id": "c4prvkmhexerx",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.26472",
  "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"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2609.26472",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-22",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/c4prvkmhexerx.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:39Z",
      "native_id": "2609.26472",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.26472"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "Bayesian Galaxy Asymmetry",
  "title_text": "Bayesian Galaxy Asymmetry",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:39Z",
  "url": "https://research.draconitic.com/paper/c4prvkmhexerx",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.3847/1538-4357/aea97a",
      "pid": "2jh58w8jxh34b",
      "relation": "published-as",
      "title": "Bayesian Galaxy Asymmetry",
      "venue": "The Astrophysical Journal"
    }
  ]
}