A full-sky prediction of the Sunyaev-Zeldovich effect from diffuse hot gas in the local universe and the upper limit from theWMAPdata

Abstract

We use the Point Source Catalogue Redshift Survey galaxy redshift catalogue combined with constrained simulations based on the IRAS 1.2-Jy galaxy density field to estimate the contribution of hot gas in the local universe to the Sunyaev‐Zeldovich (SZ) effect on a large scale. We produce a full-sky HEALPIX map predicting the SZ effect from clusters as well as diffuse hot gas within 80 h −1 Mpc. Performing cross-correlation tests between this map and the WMAP data in pixel, harmonic and wavelet space we can put an upper limit on the effect. We conclude that the SZ effect from diffuse gas in the local universe cannot be detected in current cosmic microwave background (CMB) data and is not a large-scale contaminating factor ( �< 60) in studies of CMB angular anisotropies. We derive an upper limit for the mean temperature