Speaker
Description
In this talk, I will present measurements of the cross-correlation between cosmic shear from the third-year release of the Dark Energy Survey, thermal Sunyaev-Zel'dovich maps from Planck, and X-ray maps from ROSAT. I will discuss the development of a physical model able to jointly describe these measurements while simultaneously constraining the spatial distribution and thermodynamic properties of hot gas. I will show how this model is able to describe both sets of measurements and to make reasonably accurate predictions for other observables. I will also discuss how contamination from X-ray active galactic nuclei (AGN), as well as the impact of non-thermal pressure support, must be incorporated in order to fully resolve tensions in parameter space between different data combinations. Finally, I will present constraints on the mass scale at which half of the gas content has been expelled from the halo, $log_{10}M_c = 14.83^{+0.16}_{-0.23}$, on the polytropic index of the gas,
$\Gamma = 1.144^{+0.016}_{-0.013}$, and on the ratio of the central gas temperature to the virial temperature, $\alpha_T = 1.30^{+0.15}_{-0.28}$, marginalising over AGN contributions to the signal.