{
  "abstract": "Post-starburst galaxies are galaxies which have recently and rapidly shut off star formation. AGN activity is often invoked to explain this rapid quenching, but most post-starburst selection methods select against optical AGN, motivating searches for \"post-starburst quasars.\" We present DESI observations of ten post-starburst quasars with significant MgII emission ($L_{\\text{MgII}} \\geq 3 \\times 10^{41}$ erg/s). This is the first sample of post-starburst quasars to be selected from a post-starburst galaxy parent sample rather than a quasar catalog. Quasars make up $4.6^{+1.6}_{-1.2}\\%$ of the post-starburst parent sample at $0.49 \\leq z \\leq 1.39$. Using multiwavelength AGN diagnostics, we find that $26^{+3.0}_{-2.8}\\%$ of post-starbursts in the parent sample host AGN. We find that post-starburst selection methods are biased against AGN with $\\text{L}_{\\text{Bol}}\\gtrsim10^{45} \\textrm{erg s}^{-1}$, potentially removing the quasars responsible for driving outflows that aid in quenching. Finally, we find that 9/10 post-starburst quasars in our sample have no detected broad H$β$, similar to so-called \"MgII emitters\" that may be the remnants of fading quasars; if confirmed, these objects suggest a link between post-starburst galaxies and variable AGN. Our new sample of post-starburst quasars provides a link between previously reported local and high redshift post-starburst quasars during the epoch when star formation throughout the universe was declining.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.35343",
  "author_total": 11,
  "authors": [
    {
      "name": "Margaret E. Verrico"
    },
    {
      "name": "Aayan Verma"
    },
    {
      "name": "K. Decker French"
    },
    {
      "name": "David J. Setton"
    },
    {
      "name": "Omar Almaini"
    },
    {
      "name": "Jenny E. Greene"
    },
    {
      "name": "Stephanie LaMassa"
    },
    {
      "name": "Yuanze Luo"
    },
    {
      "name": "Pallavi Patil"
    },
    {
      "name": "Kate Rowlands"
    },
    {
      "name": "Dharlenny Soto"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/4k5fvw0sbsx17.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.35343",
  "fulltext_url": null,
  "id": "4k5fvw0sbsx17",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.35343",
  "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.GA"
    ],
    [
      "openalex",
      "3103|Galaxies: Formation, Evolution, Phenomena"
    ]
  ],
  "openalex": "W7214725752",
  "pdf_url": "https://arxiv.org/pdf/2609.35343",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-28",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/4k5fvw0sbsx17.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:12Z",
      "native_id": "2609.35343",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.35343"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "Extreme MgII Emission in Recently-Quenched Galaxies: A New Sample of Intermediate-Redshift Post-Starburst Quasars from the DESI Early Data Release",
  "title_text": "Extreme MgII Emission in Recently-Quenched Galaxies: A New Sample of Intermediate-Redshift Post-Starburst Quasars from the DESI Early Data Release",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:12Z",
  "url": "https://research.draconitic.com/paper/4k5fvw0sbsx17",
  "venue": "arXiv",
  "versions": []
}