{
  "abstract": "Baryon feedback redistributes gas relative to the underlying dark matter distribution and suppresses the matter power spectrum on small scales, but the amplitude and scale dependence of this effect are uncertain. We constrain the impact of baryon feedback on the matter power spectrum by jointly analysing X-ray gas mass fractions from the eROSITA and HSC–XXL samples and Sloan Digital Sky Survey (SDSS)/Dark Energy Spectroscopic Instrument (DESI) + Atacama Cosmology Telescope (ACT) kinetic Sunyaev–Zel’dovich (kSZ) effect profiles; the samples are characterized with galaxy–galaxy lensing and together span group and cluster masses ($13 \\lt \\log _{10} \\frac{M_{500}}{\\mathrm{M}_\\odot ~h^{-1}} \\lt 14$) at $0\\lt z\\lt 1$. Using the baryonification framework, our joint eROSITA and kSZ model gives precise constraints on the suppression of the matter power spectrum: $10\\pm 2~{{\\ \\rm per\\ cent}}$ at $k=1~h~\\mathrm{Mpc}^{-1}$. The inferred gas profiles are more extended and the power suppression is stronger than predicted by the fiducial models of recent hydrodynamical simulation suites, including FLAMINGO and BAHAMAS. The HSC–XXL gas mass fractions, which the fiducial simulations were calibrated to reproduce, prefer more moderate power suppression than the kSZ and eROSITA data: $5\\pm 4~{{\\ \\rm per\\ cent}}$ at $k=1~h~\\mathrm{Mpc}^{-1}$. With a simulated LSST Year 1 weak lensing analysis, we demonstrate a framework for next-generation surveys: calibrating feedback models with multiwavelength gas observables to recover the small-scale statistical power of cosmic shear.",
  "abstract_shown": true,
  "affiliations": [
    "Department of Astrophysical Sciences, Princeton University , 4 Ivy Lane, Princeton, NJ 08544 ,",
    "Institute of Astronomy and Kavli Institute for Cosmology, University of Cambridge , Madingley Road, Cambridge CB3 0HA ,",
    "Kavli Institute for Cosmology (KICC), University of Cambridge , Madingley Road, Cambridge CB3 0HA ,",
    "Astrophysics Research Institute, Liverpool John Moores University , Liverpool L3 5RF ,",
    "Leiden Observatory, Leiden University , PO Box 9513, NL-2300 RA Leiden ,",
    "Lorentz Institute for Theoretical Physics, Leiden University , PO Box 9506, NL-2300 RA Leiden ,",
    "Department of Astrophysics, University of Zurich , Winterthurerstrasse 190, CH-8057 Zurich ,"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 9,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Jared Siegel",
      "orcid": "0000-0002-9337-0902"
    },
    {
      "affs": [
        1,
        2
      ],
      "name": "Leah Bigwood",
      "orcid": "0000-0002-9870-3331"
    },
    {
      "affs": [
        0
      ],
      "name": "Alexandra Amon",
      "orcid": "0000-0002-6445-0559"
    },
    {
      "affs": [
        0
      ],
      "name": "J. McCullough",
      "orcid": "0000-0002-4475-3456"
    },
    {
      "affs": [
        0
      ],
      "name": "M. Yamamoto",
      "orcid": "0000-0003-1585-997X"
    },
    {
      "affs": [
        3
      ],
      "name": "Ian G. McCarthy",
      "orcid": "0000-0002-1286-483X"
    },
    {
      "affs": [
        4,
        5
      ],
      "name": "Matthieu Schaller",
      "orcid": "0000-0002-2395-4902"
    },
    {
      "affs": [
        4
      ],
      "name": "Joop Schaye",
      "orcid": "0000-0002-0668-5560"
    },
    {
      "affs": [
        6
      ],
      "name": "Aurel Schneider",
      "orcid": "0000-0001-7055-8104"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/4w2k7jtzfp3ef.bib",
  "cited_by": 10,
  "doi": "10.1093/mnras/stag993",
  "fulltext_url": null,
  "id": "4w2k7jtzfp3ef",
  "issns": [
    "0035-8711",
    "1365-2966",
    "1365-8711"
  ],
  "landing_url": "https://doi.org/10.1093/mnras/stag993",
  "language": "en",
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "3103|Galaxies: Formation, Evolution, Phenomena"
    ]
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  "openalex": "W4417010760",
  "pdf_url": null,
  "pmcid": null,
  "pmid": null,
  "published": "2026-05-30",
  "publisher": "Oxford University Press",
  "ris": "https://research.draconitic.com/paper/4w2k7jtzfp3ef.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:18Z",
      "native_id": "W4417010760",
      "source": "openalex",
      "url": "https://doi.org/10.1093/mnras/stag993"
    }
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  "subjects": [
    {
      "field": "astronomy",
      "origin": "openalex:3103|Galaxies: Formation, Evolution, Phenomena",
      "subfield": "galaxies"
    }
  ],
  "title": "The suppression of the matter power spectrum: strong feedback from X-ray gas mass fractions, kSZ effect profiles, and galaxy–galaxy lensing",
  "title_text": "The suppression of the matter power spectrum: strong feedback from X-ray gas mass fractions, kSZ effect profiles, and galaxy–galaxy lensing",
  "type": "peer-reviewed",
  "updated_at": "2026-11-06T13:20:25Z",
  "url": "https://research.draconitic.com/paper/4w2k7jtzfp3ef",
  "venue": "Monthly Notices of the Royal Astronomical Society",
  "versions": []
}