{
  "abstract": "Galaxy sizes are correlated with stellar mass and redshift, as characterised by size scaling relations. The inferred forms of these scaling relations are sensitive to how galaxies are classified – either by their star formation activity (e.g. specific star-formation rate, sSFR) or by their morphology markers (e.g. bulge-to-total ratio, Sérsic index). We combine stellar mass and sSFR estimates from pop-cosmos (a generative model trained on COSMOS2020 Spitzer IRAC Ch. 1 < 26) with size and morphology measurements from COSMOS-Web, obtaining 99 369 galaxies. By investigating the size–mass and the size–redshift relations, we show that: (i) the sSFR/morphology splits give quantitatively different slopes, intercepts, and intrinsic scatter behaviour; (ii) intrinsic scatter depends on structural morphology but not on sSFR, which constrains the galaxy–halo connection; (iii) the quiescent and bulge-dominated size–mass relations both show double-power law breaks, but at different pivot masses, indicating that quenching and structural transformation occur on different time-scales; (iv) the morphology-dependent trends are only recoverable from space-based imaging. Further, the quiescent pivot mass M* ~ 1010.7 M⊙ coincides with the mass scale at which the active galactic nuclei (AGN, infrared torus) bolometric luminosity fraction peaks in transitioning galaxies, while the bulge-dominated pivot mass M* ~ 1011.1 M⊙ coincides with the halo mass at which AGN-driven baryonic redistribution peaks, which may trace the interval over which AGN feedback ramps from quenching onset to structural transformation.",
  "abstract_shown": true,
  "affiliations": [
    "Institute of Astronomy, University of Cambridge , Madingley Road, Cambridge CB3 0HA ,",
    "University of Cambridge Cavendish Laboratory, Department of Physics, , JJ Thomson Avenue, Cambridge, CB3 0HE ,",
    "Stockholm University, AlbaNova University Centre The Oskar Klein Centre, Department of Physics, , SE 106 91 Stockholm ,",
    "Astrophysics Group, Imperial College London , Blackett Laboratory, Prince Consort Road, London, SW7 2AZ ,",
    "Imperial College London Department of Mathematics, , London, SW7 2AZ ,",
    "Research Computing Services, University of Cambridge , Roger Needham Building, 7 JJ Thomson Ave, Cambridge CB3 0RB ,",
    "The Pennsylvania State University, University Park Department of Astronomy & Astrophysics, , PA 16802 ,",
    "Institute for Computational & Data Sciences, The Pennsylvania State University , University Park, PA 16802 ,",
    "Institute for Gravitation & the Cosmos, The Pennsylvania State University , University Park, PA 16802 ,"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 10,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Madalina N Tudorache",
      "orcid": "0000-0002-7288-6627"
    },
    {
      "affs": [
        0,
        1,
        2
      ],
      "name": "Hiranya V Peiris"
    },
    {
      "affs": [
        0,
        2
      ],
      "name": "Stephen Thorp",
      "orcid": "0009-0005-6323-0457"
    },
    {
      "affs": [
        0
      ],
      "name": "Sinan Deger"
    },
    {
      "affs": [
        3,
        4
      ],
      "name": "Daniel J Mortlock",
      "orcid": "0000-0002-0041-3783"
    },
    {
      "affs": [
        0,
        5
      ],
      "name": "Gurjeet Jagwani"
    },
    {
      "affs": [
        0
      ],
      "name": "Anik Halder",
      "orcid": "0000-0002-0352-9351"
    },
    {
      "affs": [
        3
      ],
      "name": "Boris Leistedt"
    },
    {
      "affs": [
        0
      ],
      "name": "Benedict Van den Bussche"
    },
    {
      "affs": [
        6,
        7,
        8
      ],
      "name": "Joel Leja",
      "orcid": "0000-0001-6755-1315"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/6d1qepsmpag34.bib",
  "cited_by": 0,
  "doi": "10.1093/mnras/stag2074",
  "fulltext_url": null,
  "id": "6d1qepsmpag34",
  "issns": [
    "0035-8711",
    "1365-2966"
  ],
  "landing_url": "https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stag2074/9005624",
  "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/stag2074/72621458/stag2074.pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-30",
  "publisher": "Oxford University Press (OUP)",
  "ris": "https://research.draconitic.com/paper/6d1qepsmpag34.ris",
  "sources": [
    {
      "first_seen": "2026-10-31T00:20:43Z",
      "native_id": "10.1093/mnras/stag2074",
      "source": "crossref",
      "url": "https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stag2074/9005624"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "journal-openalex:3103|Stellar, planetary, and galactic studies",
      "subfield": "stellar"
    }
  ],
  "title": "pop-cosmos : Galaxy size evolution across structural and star-formation classifications in COSMOS-Web",
  "title_text": "pop-cosmos : Galaxy size evolution across structural and star-formation classifications in COSMOS-Web",
  "type": "peer-reviewed",
  "updated_at": "2026-11-01T00:20:40Z",
  "url": "https://research.draconitic.com/paper/6d1qepsmpag34",
  "venue": "Monthly Notices of the Royal Astronomical Society",
  "versions": []
}