New Planck tSZ map and its cosmological analysis
Résumé
We constructed a new all-sky Compton parameter map (y-map) of the thermal Sunyaev-Zel’dovich (tSZ) effect by applying the MILCA component separation algorithm to the 100 to 857 GHz frequency channel maps from the Planck data release 4. The Planck team performed several improvements for the new channel maps in terms of noises and systematics, and it allowed us to produce a new y-map with reduced noises by ∼7% and minimal survey strips compared to the previous version released in 2015. We computed the tSZ angular power spectrum of the new y-map and performed a cosmological analysis. The results showed S8=0.764−0.018+0.015(stat)−0.016+0.031(sys), including systematic uncertainties from a hydrostatic mass bias and pressure profile model. The value is fully consistent with recent KiDS and DES weak-lensing observations. It is also consistent with the Planck CMB’s result within 2σ, while our result is slightly lower.