{
  "abstract": "The processes that rapidly quench massive galaxies and maintain their quiescence remain poorly understood. Substantial molecular gas reservoirs can survive this shutdown in post-starburst galaxies, raising the question of what prevents the remaining gas from efficiently forming stars. We present deep, subarcsecond VLA 6 GHz observations of 52 massive SQuIGGLE post-starburst galaxies at $z\\sim0.7$ to test the prevalence and mechanical impact of radio activity during the gas-rich post-burst phase. We detect 6 GHz continuum emission in 18/52 galaxies ($\\approx$35\\%), spanning $\\log(L_{1.4\\,{\\rm GHz}}/{\\rm W\\,Hz^{-1}})\\simeq23.0$--$25.0$ and generally exceeding the contributions expected from ongoing star formation and the fading starburst, favoring an AGN origin. Ancillary data at other wavelengths provide little evidence for a population of luminous, radiatively efficient AGN, suggesting that these sources are instead dominated by comparatively weak, mechanically powered radio AGN. Radio activity is strongly concentrated within the first $\\sim$200 Myr post-burst and is predominantly associated with galaxies retaining substantial gas reservoirs. Above a common radio luminosity threshold, the radio detection fraction is enhanced by a factor of $\\approx$2.5 relative to the radio AGN candidate fraction in mass- and redshift-matched quiescent LEGA-C galaxies, primarily due to lower power sources. For efficient jet--ISM coupling, the inferred mechanical power could supply the approximate energy required to unbind the molecular gas on timescales comparable to its observed decline. Together, these results identify a population of radiatively inefficient AGN hosted predominantly by young, gas-rich post-starburst galaxies at $z\\sim0.7$ and suggest that they may have a role in maintaining inefficient star formation.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.19146",
  "author_total": 16,
  "authors": [
    {
      "name": "Vincenzo R. D'Onofrio"
    },
    {
      "name": "Justin S. Spilker"
    },
    {
      "name": "Krista L. Smith"
    },
    {
      "name": "Rachel Bezanson"
    },
    {
      "name": "Robert Feldmann"
    },
    {
      "name": "Alex J. Geiger"
    },
    {
      "name": "Andy D. Goulding"
    },
    {
      "name": "Jenny E. Greene"
    },
    {
      "name": "Mariska Kriek"
    },
    {
      "name": "Anika Kumar"
    },
    {
      "name": "Yuanze Luo"
    },
    {
      "name": "Desika Narayanan"
    },
    {
      "name": "David J. Setton"
    },
    {
      "name": "Katherine A. Suess"
    },
    {
      "name": "Margaret E. Verrico"
    },
    {
      "name": "Pengpei Zhu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/ewtz7h32z05b9.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.19146",
  "fulltext_url": null,
  "id": "ewtz7h32z05b9",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.19146",
  "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",
      "3103|Galaxies: Formation, Evolution, Phenomena"
    ]
  ],
  "openalex": "W7222205687",
  "pdf_url": "https://arxiv.org/pdf/2610.19146",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-13",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/ewtz7h32z05b9.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:31Z",
      "native_id": "2610.19146",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.19146"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "SQuIGGLE: Radio AGN Found Predominantly in Young, Gas-rich Post-starburst Galaxies at z ~ 0.7",
  "title_text": "SQuIGGLE: Radio AGN Found Predominantly in Young, Gas-rich Post-starburst Galaxies at z ~ 0.7",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:31Z",
  "url": "https://research.draconitic.com/paper/ewtz7h32z05b9",
  "venue": "arXiv",
  "versions": []
}