{
  "abstract": "We constrain the $z \\approx 1$ HI distribution by jointly modeling two independent, existing observations of the 21-cm signal, the HI density parameter $Ω_{\\rm HI}$ measured using uGMRT by stacking the 21-cm emission from blue, star-forming galaxies, and the 21-cm autocorrelation power spectrum (PS) measured using CHIME. We assign HI to the dark matter halos in a cosmological simulation using an HI mass-halo mass (HIHM) relation with three free parameters whose values we estimate by performing a joint Bayesian inference comparing the simulated $Ω_{\\rm HI}$ and 21-cm PS with the measurements. We use the inferred HIHM posterior to simulate the HI distribution and predict the $z \\approx 1$ HI mass function (HIMF). We find that the HIMF remains nearly constant at low HI masses $( \\lesssim 3.6 \\times 10^9 M_\\odot)$, and it declines rapidly for larger HI masses. Around $\\sim 90$ percent of the total HI gas is contained in the mass range $M_{\\rm HI} \\in [2 \\times 10^9, \\, 4 \\times 10^{11}] \\, M_\\odot$. Our estimates predict a larger abundance of high mass HI galaxies than predicted by earlier observations and hydrodynamical simulations. We expect these results to be useful in understanding galaxy evolution and star formation.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2607.24412",
  "author_total": 3,
  "authors": [
    {
      "name": "Minal Chhabra"
    },
    {
      "name": "Raghunath Ghara"
    },
    {
      "name": "Somnath Bharadwaj"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/bq3873aqjd85h.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2607.24412",
  "fulltext_url": null,
  "id": "bq3873aqjd85h",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2607.24412",
  "language": null,
  "licence": "CC-BY-NC-ND-4.0",
  "licence_label": "CC BY-NC-ND 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-nc-nd/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/2607.24412",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/bq3873aqjd85h.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:31Z",
      "native_id": "2607.24412",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2607.24412"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "Constraining the $z \\approx 1$ neutral hydrogen (HI) distribution",
  "title_text": "Constraining the z ≈ 1 neutral hydrogen (HI) distribution",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:31Z",
  "url": "https://research.draconitic.com/paper/bq3873aqjd85h",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.3847/2041-8213/aea790",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}