The suppression of the matter power spectrum: strong feedback from X-ray gas mass fractions, kSZ effect profiles, and galaxy–galaxy lensing
7 affiliations
- 1Department of Astrophysical Sciences, Princeton University , 4 Ivy Lane, Princeton, NJ 08544 ,
- 2Institute of Astronomy and Kavli Institute for Cosmology, University of Cambridge , Madingley Road, Cambridge CB3 0HA ,
- 3Kavli Institute for Cosmology (KICC), University of Cambridge , Madingley Road, Cambridge CB3 0HA ,
- 4Astrophysics Research Institute, Liverpool John Moores University , Liverpool L3 5RF ,
- 5Leiden Observatory, Leiden University , PO Box 9513, NL-2300 RA Leiden ,
- 6Lorentz Institute for Theoretical Physics, Leiden University , PO Box 9506, NL-2300 RA Leiden ,
- 7Department of Astrophysics, University of Zurich , Winterthurerstrasse 190, CH-8057 Zurich ,
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 M500/(M⊙ h−1) lt 14) at 0lt zlt 1. Using the baryonification framework, our joint eROSITA and kSZ model gives precise constraints on the suppression of the matter power spectrum: 10± 2 per cent at k=1 h 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± 4 per cent at k=1 h 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.
Related
- Baryonic feedback suppression of the matter power spectrum: a three-parameter fitting formula and its single-parameter reduction
- Model-Independent Measurement of Baryon Gas Fractions through Galaxy-Galaxy Lensing and the Kinematic Sunyaev-Zel'dovich Effect
- A comprehensive assessment of weak-lensing inferred circular velocity profiles of isolated galaxies
- Baryonification IV: Constraining baryonic feedback with X-ray gas fractions
- Calibrating baryonic feedback with weak lensing and fast radio bursts
BibTeX
@article{siegel2026suppression,
title = {{The suppression of the matter power spectrum: strong feedback from X-ray gas mass fractions, kSZ effect profiles, and galaxy–galaxy lensing}},
author = {Jared Siegel and Leah Bigwood and Alexandra Amon and J. McCullough and M. Yamamoto and Ian G. McCarthy and Matthieu Schaller and Joop Schaye and Aurel Schneider},
journal = {Monthly Notices of the Royal Astronomical Society},
year = {2026},
month = may,
doi = {10.1093/mnras/stag993},
url = {https://doi.org/10.1093/mnras/stag993},
note = {CC BY},
}
RIS
TY - JOUR
TI - The suppression of the matter power spectrum: strong feedback from X-ray gas mass fractions, kSZ effect profiles, and galaxy–galaxy lensing
AU - Jared Siegel
AU - Leah Bigwood
AU - Alexandra Amon
AU - J. McCullough
AU - M. Yamamoto
AU - Ian G. McCarthy
AU - Matthieu Schaller
AU - Joop Schaye
AU - Aurel Schneider
PY - 2026
DA - 2026/05/30
JO - Monthly Notices of the Royal Astronomical Society
DO - 10.1093/mnras/stag993
UR - https://doi.org/10.1093/mnras/stag993
AB - 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 M_500/(M_⊙ h^−1) lt 14) at 0lt zlt 1. Using the baryonification framework, our joint eROSITA and kSZ model gives precise constraints on the suppression of the matter power spectrum: 10± 2 per cent at k=1 h 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± 4 per cent at k=1 h 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.
SN - 0035-8711
SN - 1365-2966
SN - 1365-8711
ER -