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Herschel and Planck are surveying the sky at unprecedented angular scales andsensitivities over large areas. But both experiments are limited by sourceconfusion in the submillimeter. The high confusion noise in particularrestricts the study of the clustering properties of the sources that dominatethe cosmic infrared background. At these wavelengths, it is more appropriate toconsider the statistics of the unresolved component. In particular, highclustering will contribute in excess of Poisson noise in the power spectra ofCIB anisotropies. These power spectra contain contributions from sources at allredshift. We show how the stacking technique can be used to separate thedifferent redshift contributions to the power spectra. We use simulations ofCIB representative of realistic Spitzer, Herschel, Planck, and SCUBA-2observations. We stack the 24um sources in longer wavelengths maps to measuremean colors per redshift and flux bins. The information retrieved on the meanspectral energy distribution obtained with the stacking technique is then usedto clean the maps, in particular to remove the contribution of low-redshiftundetected sources to the anisotropies. Using the stacking, we measure the meanflux of populations 4 to 6 times fainter than the total noise at 350um atredshifts z=1 and z=2, respectively, and as faint as 6 to 10 times fainter thanthe total noise at 850um at the same redshifts. In the deep Spitzer fields, thedetected 24um sources up to z~2 contribute significantly to the submillimeteranisotropies. We show that the method provides excellent (using COSMOS 24umdata) to good (using SWIRE 24um data) removal of the z<2 (COSMOS) and z<1(SWIRE) anisotropies. Using this cleaning method, we then hope to have a set oflarge maps dominated by high redshift galaxies for galaxy evolution study(e.g., clustering, luminosity density).

astronomy and astrophysics

Simulations of the cosmic infrared and submillimeter background for  future large surveys: II. Removing the low-redshift contribution to the  anisotropies using stacking