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We study the Compton scattering of Cosmic Microwave Background (CMB) photons off free electrons in the Universe (the so called thermal Sunyaev-Zel’dovich effect, [tSZ]). The spectral distortions introduced by this effect on the CMB can be used to search for the missing baryons. We analyse a state-of-the-art hydrodynamical cosmological simulation to study the different sources of tSZ: it shows that most missing baryons give rise to a negligible (< 1%) fraction of the total tSZ luminosity. However, we find a tight correlation between the galaxy number density and gas pressure, and this allows us to predict the tSZ from existing galaxy catalogs and propose methods to unveil diffuse gas in future CMB maps.

Galaxy catalogs and the diffuse warm gas phase.