Orateur
Description
This talk will highlight the LiteBIRD space mission's capability to map the thermal Sunyaev-Zeldovich (SZ) effect, arising from the scattering of CMB photons by hot baryonic gas within and around galaxy clusters. Although primarily designed to search for large-scale CMB B-mode polarization, LiteBIRD will deliver full-sky maps in total intensity with unprecedented sensitivity across 15 frequency bands ranging from 40 to 402 GHz, thus offering an extensive dataset for detailed extraction and mapping of the thermal SZ effect. Despite its lower angular resolution, LiteBIRD outperforms ESA’s Planck mission in both sensitivity and frequency coverage, allowing for the reconstruction of a new all-sky map of the thermal SZ Compton y-parameter ("y-map") with significantly reduced foreground contamination at large and intermediate angular scales compared to Planck. Moreover, combining LiteBIRD and Planck datasets into the component separation pipeline enables to produce an optimized y-map that leverages both LiteBIRD's sensitivity and Planck's angular resolution, improving cosmological constraints on sigma8 by 15% compared to the Planck y-map alone. The talk will also discuss the cosmological potential unlocked by a clean, all-sky map of diffuse thermal SZ emission from LiteBIRD.
