Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-02-10
Mon.Not.Roy.Astron.Soc. 361 (2005) 753-762
Astronomy and Astrophysics
Astrophysics
submitted to MNRAS
Scientific paper
10.1111/j.1365-2966.2005.09210.x
We use the PSCz 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 SZ-effect on large scales. We produce a full sky Healpix map predicting the SZ-effect from clusters as well as diffuse hot gas within 80Mpc/h. 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 CMB data and is not a contaminating factor on large scales (l<60) in studies of the CMB angular anisotropies. However, for future high sensitivity experiments observing at a wider range of frequencies, the predicted large scale SZ effect could be of importance.
Branchini Enzo
Cabella Paolo
Dolag Klaus
Hansen Frode K.
Mazzotta Pasquale
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