{
  "abstract": "We report the detection of the cosmological power spectrum using the intensity mapping signal from 21 cm emission of neutral hydrogen (H I ), derived from interferometric observations with the L -band receivers of the MeerKAT radio telescope. Intensity mapping is a promising technique to map the three-dimensional matter distribution of the Universe at radio frequencies and probe the underlying cosmology. So far, detections have only been achieved through cross-correlations with galaxy surveys. Here we present independent measurements of the H I power spectrum at redshifts 0.32 and 0.44 with the foreground avoidance method. We utilize two distinct frameworks for mitigating systematics: a conservative baseline-flagging-based approach achieves detections at 3.2 σ and 3.5 σ , and a power-spectrum-based flagging method enhances the significance to 5.9 σ and 9.18 σ , respectively. The information contained in the power spectrum measurements allows us to probe the parameters of the H I mass function and H I halo model. These results are a significant step toward precision cosmology with H I intensity mapping using the new generation of radio telescopes.",
  "abstract_shown": true,
  "affiliations": [
    "McGill University",
    "The University of Manchester",
    "University of the Western Cape",
    "The University of Edinburgh",
    "South African Radio Observatory (SARAO)"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 4,
  "authors": [
    {
      "affs": [
        0,
        1,
        2
      ],
      "name": "Sourabh Paul",
      "orcid": "0000-0002-8671-2177"
    },
    {
      "affs": [
        3,
        1
      ],
      "name": "Zhaoting Chen",
      "orcid": "0000-0002-4965-8239"
    },
    {
      "affs": [
        4,
        2
      ],
      "name": "Mário G. Santos",
      "orcid": "0000-0003-3892-3073"
    },
    {
      "affs": [
        1
      ],
      "name": "Laura Wolz",
      "orcid": "0000-0003-3334-3037"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/d90sr8tf73eaj.bib",
  "cited_by": 36,
  "doi": "10.3847/2041-8213/ae808f",
  "fulltext_url": null,
  "id": "d90sr8tf73eaj",
  "issns": [
    "2041-8205",
    "2041-8213"
  ],
  "landing_url": "https://doi.org/10.3847/2041-8213/ae808f",
  "language": "en",
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "3103|Radio Astronomy Observations and Technology"
    ]
  ],
  "openalex": "W4318719614",
  "pdf_url": null,
  "pmcid": null,
  "pmid": null,
  "published": "2026-07-06",
  "publisher": "IOP Publishing",
  "ris": "https://research.draconitic.com/paper/d90sr8tf73eaj.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:18Z",
      "native_id": "W4318719614",
      "source": "openalex",
      "url": "https://doi.org/10.3847/2041-8213/ae808f"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "journal-openalex:3103|Stellar, planetary, and galactic studies",
      "subfield": "stellar"
    }
  ],
  "title": "A Direct Detection of Neutral Hydrogen Intensity Mapping on Mpc Scales at z ≈ 0.32 and z ≈ 0.44",
  "title_text": "A Direct Detection of Neutral Hydrogen Intensity Mapping on Mpc Scales at z ≈ 0.32 and z ≈ 0.44",
  "type": "peer-reviewed",
  "updated_at": "2026-11-05T13:20:42Z",
  "url": "https://research.draconitic.com/paper/d90sr8tf73eaj",
  "venue": "The Astrophysical Journal Letters",
  "versions": []
}