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McCarthy, IG, Amon, A, Schaye, J, Schaan, E, Angulo, RE, Salcido, J, Schaller, M, Bigwood, L, Elbers, W, Kugel, R, Helly, JC, Moreno, VJF, Frenk, CS, McGibbon, RJ, Ondaro-Mallea, L and Daalen, MPV (2025) FLAMINGO: combining kinetic SZ effect and galaxy-galaxy lensing measurements to gauge the impact of feedback on large-scale structure. Monthly Notices of the Royal Astronomical Society, 540 (1). pp. 143-163. ISSN 0035-8711
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Abstract
Energetic feedback processes associated with accreting supermassive black holes can expel gas from massive haloes and significantly alter various measures of clustering on ∼Mpc scales, potentially biasing the values of cosmological parameters inferred from analyses of large-scale structure (LSS) if not modelled accurately. Here, we use the state-of-the-art FLAMINGO suite of cosmological hydrodynamical simulations to gauge the impact of feedback on large-scale structure by comparing to Planck + ACT stacking measurements of the kinetic Sun yaev–Zel’do vich (kSZ) effect of SDSS BOSS galaxies. We make careful lik e-with-lik e comparisons to the observations, aided by high precision KiDS and DES g alaxy–g alaxy lensing measurements of the BOSS galaxies to inform the selection of the simulated galaxies. In qualitative agreement with several recent studies using dark matter only simulations corrected for baryonic effects, we find that the kSZ effect measurements prefer stronger feedback than predicted by simulations which have been calibrated to reproduce the gas fractions of low redshift X-ray-selected groups and clusters. We find that the increased feedback can help to reduce the so-called S 8 tension between the observed and CMB-predicted clustering on small scales as probed by cosmic shear (although at the expense of agreement with the X-ray group measurements). Ho we ver, the increased feedback is only marginally ef fecti ve at reducing the reported of fsets between the predicted and observed clustering as probed by the thermal SZ (tSZ) ef fect po wer spectrum and tSZ effect – weak lensing cross-spectrum, both of which are sensitive to higher halo masses than cosmic shear.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | astro-ph.CO; astro-ph.CO; 5106 Nuclear and Plasma Physics; 51 Physical Sciences |
| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
| Divisions: | Astrophysics Research Institute |
| Publisher: | Oxford University Press |
| Related URLs: | |
| Date of acceptance: | 30 April 2025 |
| Date of first compliant Open Access: | 2 May 2025 |
| Date Deposited: | 02 May 2025 10:47 |
| Last Modified: | 20 May 2025 13:15 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/26298 |
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