{
  "abstract": "Current investigations of cold gas in the interstellar medium face selection biases, as optical/near-infrared surveys favor massive, low-obscuration galaxies and miss gas-rich passive or inefficient star-forming systems. Overcoming this requires large-volume line surveys selected by molecular gas rather than stellar luminosity. We present a molecular gas census across $0.5 < z < 5$ using ALMA Band 4 observations from the Extended Mapping of Obscuration to Reionization Survey (Ex-MORA), covering 577 arcmin$^2$. Combining an unbiased search for bright emitters with a targeted search using spectroscopic redshift priors, we detect 52 galaxies in CO or \\ci transitions (two showing two lines). Physical properties were derived via \\texttt{CIGALE} with non-parametric star-formation histories, and gas masses were estimated using metallicity-dependent conversion factors. The sample is dominated by main-sequence (MS) galaxies with high stellar masses (median $\\log M_*/\\text{M}_{\\odot} = 10.83$) and large gas reservoirs ($>10^{10}\\,\\text{M}_{\\odot}$). Gas fraction ($μ_{\\text{gas}}$) increases with redshift for active populations, though high-redshift trends are influenced by a gas-rich protocluster at $z \\approx 2.4$. Conversely, an overdensity at $z \\approx 0.73$ mirrors the field population. Five Green Valley (GV) galaxies exhibit a $μ_{\\text{gas}}$ peak at cosmic noon, suggesting stellar feedback may suppress star formation by heating gas rather than rapidly depleting it in at least some transitional systems. Resolved kinematics show a prevalence of rotating disks. These results demonstrate that wide-area line searches effectively recover massive gas reservoirs across diverse evolutionary stages",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.10165",
  "author_total": 12,
  "authors": [
    {
      "name": "V. Catán"
    },
    {
      "name": "J. González-López"
    },
    {
      "name": "M. Aravena"
    },
    {
      "name": "A. S. Long"
    },
    {
      "name": "C. M. Casey"
    },
    {
      "name": "D. L. Clements"
    },
    {
      "name": "E. da Cunha"
    },
    {
      "name": "M. Franco"
    },
    {
      "name": "A. M. Koekemoer"
    },
    {
      "name": "A. Man"
    },
    {
      "name": "J. Spilker"
    },
    {
      "name": "E. Treister"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/e3vp2b4ntm9qv.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.10165",
  "fulltext_url": null,
  "id": "e3vp2b4ntm9qv",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.10165",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.GA"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2608.10165",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-31",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/e3vp2b4ntm9qv.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:00Z",
      "native_id": "2608.10165",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.10165"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "The Extended Mapping Obscuration to Reionization with ALMA (Ex-MORA) Survey: A Molecular Gas Line Search",
  "title_text": "The Extended Mapping Obscuration to Reionization with ALMA (Ex-MORA) Survey: A Molecular Gas Line Search",
  "type": "preprint",
  "updated_at": "2026-10-30T12:18:00Z",
  "url": "https://research.draconitic.com/paper/e3vp2b4ntm9qv",
  "venue": "arXiv",
  "versions": []
}