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

TL;DR

This paper introduces a new tomographic method to simultaneously measure the evolution of electron pressure and star formation rate density using tSZ and CIB signals, providing robust, galaxy-clustering independent results.

Contribution

The novel approach combines tSZ and CIB data for independent, contamination-resistant measurements of cosmic electron pressure and star formation evolution.

Findings

Measurements agree with FLAMINGO simulation predictions

Lower gas pressure observed at low redshifts

Results are publicly available and robust against contamination

Abstract

We present a novel method for the tomographic reconstruction of the bias-weighted mean electron pressure $\langle bP_e \rangle$ and star formation rate density $\langle b\rho_{\mathrm{SFR}} \rangle$, 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 $\langle bP_e \rangle$ and $\langle b\rho_{\mathrm{SFR}} \rangle$ out to $z\sim1$, 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.