{
  "abstract": "We identify a population of diluted early-type galaxies (ETGs) with gas-phase metallicities significantly below the local mass-metallicity relation. After matching to a sample of undiluted galaxies matched in stellar mass and redshift, we show that the metallicity deficit remains highly significant. Morphological classification does not provide statistically significant evidence for different star-formation responses: disturbed systems exhibit both metallicity dilution and enhanced star formation, while quiet diluted ETGs show substantial metallicity deficits but the sample too small to detect a similar enhancement at high significance. A simple gas-mixing model shows that the observed metallicity deficit can be reproduced through the accretion of metal-poor gas, requiring an accreted gas mass of only ~7% of the stellar mass. We suggest that metal-poor gas accretion is a common origin of diluted ETGs, while whether their subsequent star-formation response depends on the dynamical state of the host galaxy remains an open question.",
  "abstract_shown": true,
  "affiliations": [
    "CAS Key Laboratory of Optical Astronomy, National Astronomical Observatories 1 , Beijing, 100101 ,"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 1,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Yu-Zhong Wu",
      "orcid": "0000-0002-7670-9062"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/96nv61mv3fhh1.bib",
  "cited_by": 0,
  "doi": "10.1093/mnras/stag2103",
  "fulltext_url": null,
  "id": "96nv61mv3fhh1",
  "issns": [
    "0035-8711",
    "1365-2966"
  ],
  "landing_url": "https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stag2103/9012714",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [],
  "openalex": null,
  "pdf_url": "https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stag2103/73037051/stag2103.pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-04",
  "publisher": "Oxford University Press (OUP)",
  "ris": "https://research.draconitic.com/paper/96nv61mv3fhh1.ris",
  "sources": [
    {
      "first_seen": "2026-11-05T00:20:45Z",
      "native_id": "10.1093/mnras/stag2103",
      "source": "crossref",
      "url": "https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stag2103/9012714"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "journal-openalex:3103|Stellar, planetary, and galactic studies",
      "subfield": "stellar"
    }
  ],
  "title": "Metallicity Dilution Without a Detectable Star Formation Difference in Morphologically Disturbed versus Quiet Early-Type Galaxies",
  "title_text": "Metallicity Dilution Without a Detectable Star Formation Difference in Morphologically Disturbed versus Quiet Early-Type Galaxies",
  "type": "peer-reviewed",
  "updated_at": "2026-11-06T00:21:01Z",
  "url": "https://research.draconitic.com/paper/96nv61mv3fhh1",
  "venue": "Monthly Notices of the Royal Astronomical Society",
  "versions": []
}