A full-sky prediction of the Sunyaev–Zeldovich effect from diffuse hot gas in the local universe and the upper limit from the WMAP data |
| |
Authors: | F K Hansen E Branchini P Mazzotta P Cabella K Dolag |
| |
Institution: | Institute of Theoretical Astrophysics, University of Oslo, PO Box 1029 Blindern, N-0315 Oslo, Norway;Dipartimento di Fisica, Universitàdi Roma TRE, Via della Vasca Navale 84, I-00146 Roma, Italy;Dipartimento di Fisica, Universitàdi Roma 'Tor Vergata', Via della Ricerca Scientifica 1, I-00133 Roma, Italy;Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA;Max Planck Institut für Astrophysik, Karl-Scharzschild-Strasse 1, Postfach 1317, D-85741 Garching bei München, Germany |
| |
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 (ℓ < 60) in studies of CMB angular anisotropies. We derive an upper limit for the mean temperature decrement of Δ T < 0.33 μK at the 2σ confidence level for the 61-GHz frequency channel. However, for future high-sensitivity experiments observing at a wider range of frequencies, the predicted large-scale SZ effect could be of importance. |
| |
Keywords: | methods: data analysis methods: statistical techniques: image processing cosmology: cosmic microwave background cosmology: observations |
|
|