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The thermal Sunyaev-Zel'dovich (tSZ) effect is a powerful tool with thepotential for constraining directly the properties of the hot gas thatdominates dark matter halos because it measures pressure and thus thermalenergy density. Studying this hot component of the circumgalactic medium (CGM)is important because it is strongly impacted by star-formation and activegalactic nuclei (AGN) activity in galaxies, participating in the feedback loopthat regulates star and black hole mass growth in galaxies.  We study the tSZ effect across a wide halo mass range using threecosmological hydrodynamical simulations: Illustris-TNG, EAGLE, and FIRE-2.Specifically, we present the scaling relation between tSZ signal and halo massand radial profiles of gas density, temperature, and pressure for all threesimulations. The analysis includes comparisons to Planck tSZ observations andto the thermal pressure profile inferred from the Atacama Cosmology Telescope(ACT) measurements. We compare these tSZ data to the simulations to interpretthe measurements in terms of feedback and accretion processes in the CGM. Wealso identify as-yet unobserved potential signatures of these processes thatmay be visible in future measurements, which will have the capability ofmeasuring tSZ signals to even lower masses. We also perform internalcomparisons between runs with different physical assumptions. We conclude: (1)there is strong evidence for the impact of feedback at $R_{500}$ but that thisimpact decreases by $5R_{500}$, and (2) the thermodynamic profiles of the CGMare highly dependent on the implemented model, such as cosmic-ray or AGNfeedback prescriptions.

Probing Hot Gas Components of Circumgalactic Medium in Cosmological Simulations with the Thermal Sunyaev-Zel'dovich Effect