Abstract

Small temperature anisotropies in the Cosmic Microwave Background can be sourced by density perturbations via the late-time integrated Sachs-Wolfe effect. Large voids and superclusters are excellent environments to make a localized measurement of this tiny imprint. In some cases excess signals have been reported. We probed these claims with an independent data set, using the first year data of the Dark Energy Survey in a different footprint, and using a different super-structure finding strategy. We identified 52 large voids and 102 superclusters at redshifts 0.2<z<0.650.2 < z < 0.65. We used the Jubilee simulation to a priori evaluate the optimal ISW measurement configuration for our compensated top-hat filtering technique, and then performed a stacking measurement of the CMB temperature field based on the DES data. For optimal configurations, we detected a cumulative cold imprint of voids with ΔTf5.0±3.7 μK\Delta T_{f} \approx -5.0\pm3.7~\mu K and a hot imprint of superclusters ΔTf5.1±3.2 μK\Delta T_{f} \approx 5.1\pm3.2~\mu K ; this is 1.2σ\sim1.2\sigma higher than the expected ΔTf0.6 μK|\Delta T_{f}| \approx 0.6~\mu K imprint of such super-structures in Λ\LambdaCDM. If we instead use an a posteriori selected filter size (R/Rv=0.6R/R_{v}=0.6), we can find a temperature decrement as large as ΔTf9.8±4.7 μK\Delta T_{f} \approx -9.8\pm4.7~\mu K for voids, which is 2σ\sim2\sigma above Λ\LambdaCDM expectations and is comparable to previous measurements made using SDSS super-structure data

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