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We constructed a new all-sky Compton parameter map (y-map) of the thermalSunyaev-Zel'dovich (tSZ) effect from the 100 to 857 GHz frequency channel mapsdelivered within the Planck data release 4. The improvements in terms of noiseand systematic effects translated into a y-map with a noise level smaller by~7% compared to the maps released in 2015, and with significantly reducedsurvey stripes. The produced 2020 y-map is also characterized by residualforeground contamination, mainly due to thermal dust emission at large angularscales and to CIB and extragalactic point sources at small angular scales.Using the new Planck data, we computed the tSZ angular power spectrum and foundthat the tSZ signal dominates the y-map in the multipole range, 60 < l < 600.We performed the cosmological analysis with the tSZ angular power spectrum andfound S8=0.764+0.015-0.018(stat)+0.031-0.016(sys), including systematicuncertainties from a hydrostatic mass bias and pressure profile model. The S8value may differ by +-0.016 depending on the hydrostatic mass bias model and by+0.021 depending on the pressure profile model used for the analysis. Theobtained value is fully consistent with recent KiDS and DES weak-lensingobservations. While our result is slightly lower than the Planck CMB one, it isconsistent with the latter within 2 sigma.

Constraining cosmology with a new all-sky Compton parameter map from the Planck PR4 data