FLAMINGO: combining kinetic SZ effect and galaxy-galaxy lensing measurements to gauge the impact of feedback on large-scale structure

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 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. ISSN 0035-8711 (Accepted)

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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 Sunyaev-Zel'dovich (kSZ) effect of SDSS BOSS galaxies. We make careful like-with-like comparisons to the observations, aided by high precision KiDS and DES galaxy-galaxy 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 S8 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). However, the increased feedback is only marginally effective at reducing the reported offsets between the predicted and observed clustering as probed by the thermal SZ (tSZ) effect power spectrum and tSZ effect--weak lensing cross-spectrum, both of which are sensitive to higher halo masses than cosmic shear.

Item Type:	Article
Additional Information:	This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society Published by Oxford University Press.
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:	http://arxiv.org/abs/2410.19905v1
Date of acceptance:	30 April 2025
Date of first compliant Open Access:	2 May 2025
Date Deposited:	02 May 2025 10:47
Last Modified:	02 May 2025 11:00
DOI or ID number:	10.48550/arxiv.2410.19905
URI:	https://researchonline.ljmu.ac.uk/id/eprint/26298

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