Joint tomographic measurement of thermal Sunyaev Zeldovich and the cosmic infrared background

Abstract

We present a novel method for the tomographic reconstruction of the bias-weighted mean electron pressure $⟨b{P}_e⟩$ and star formation rate density $⟨b{\rho }_{\mathrm{SFR}}⟩$, by simultaneously modelling the contribution from the thermal Sunyaev-Zel'dovich (tSZ) effect and the Cosmic Infrared Background (CIB) to the cross-correlation between photometric galaxy samples and multi-frequency Cosmic Microwave Background (CMB) maps. The resulting measurements are independent of the galaxy clustering properties and robust against cross-contamination between tSZ and CIB. Applying this method to publicly available data, we reconstruct the cosmic evolution of $⟨b{P}_e⟩$ and $⟨b{\rho }_{\mathrm{SFR}}⟩$ out to $z\sim 1$, making our measurements publicly available. Our measurements of both quantities are broadly compatible with predictions from the fiducial FLAMINGO hydrodynamical simulation, although we observe a lower gas pressure at low redshifts, in agreement with other measurements.