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Insights on gas thermodynamics from the combination of x-ray and thermal Sunyaev-Zel’dovich data cross correlated with cosmic shear

Adrien La Posta1,*, David Alonso1, Nora Elisa Chisari2,3, Tassia Ferreira1, and Carlos García-García1

  • 1Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, United Kingdom
  • 2Institute for Theoretical Physics, Utrecht University, Princetonplein 5, 3584 CC, Utrecht, The Netherlands
  • 3Leiden Observatory, Leiden University, Niels Bohrweg 2,2333 CA, Leiden, The Netherlands

  • *Contact author: adrien.laposta@physics.ox.ac.uk
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Phys. Rev. D 112, 043525 – Published 21 August, 2025

DOI: https://doi.org/10.1103/m77z-w7pl

Abstract

We measure the cross-correlation between cosmic shear from the third-year release of the Dark Energy Survey, thermal Sunyaev-Zel’dovich (tSZ) maps from Planck, and x-ray maps from ROSAT. We investigate the possibility of developing a physical model able to jointly describe both measurements, simultaneously constraining the spatial distribution and thermodynamic properties of hot gas. We find that a relatively simple model is able to describe both sets of measurements and to make reasonably accurate predictions for other observables (the tSZ autocorrelation, its cross-correlation with x-rays, and tomographic measurements of the bias-weighted mean gas pressure). We show, however, that contamination from x-ray active galactic nuclei (AGN), as well as the impact of nonthermal pressure support, must be incorporated in order to fully resolve tensions in parameter space between different data combinations. Combining the tSZ and x-ray cross-correlations with cosmic shear we obtain simultaneous constraints on the mass scale at which half of the gas content has been expelled from the halo, log10Mc=14.83−0.23+0.16, on the polytropic index of the gas, Γ=1.144−0.013+0.016, and on the ratio of the central gas temperature to the virial temperature αT=1.30−0.28+0.15, marginalizing over AGN contributions to the signal.

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Phys. Rev. D 112, 043525– Published 21 August, 2025
  • Received 20 January 2025
  • Accepted 10 July 2025
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