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We report the detection of a cross-correlation signal between {\it Fermi}Large Area Telescope diffuse gamma-ray maps and catalogs of clusters. In ouranalysis, we considered three different catalogs: WHL12, redMaPPer andPlanckSZ. They all show a positive correlation with different amplitudes,related to the average mass of the objects in each catalog, which also sets thecatalog bias. The signal detection is confirmed by the results of a stackinganalysis. The cross-correlation signal extends to rather large angular scales,around 1 degree, that correspond, at the typical redshift of the clusters inthese catalogs, to a few to tens of Mpc, i.e. the typical scale-length of thelarge scale structures in the Universe. Most likely this signal is contributedby the cumulative emission from AGNs associated to the filamentary structuresthat converge toward the high peaks of the matter density field in which galaxyclusters reside. In addition, our analysis reveals the presence of a secondcomponent, more compact in size and compatible with a point-like emission fromwithin individual clusters. At present, we cannot distinguish between the twomost likely interpretations for such a signal, i.e. whether it is produced byAGNs inside clusters or if it is a diffuse gamma-ray emission from theintra-cluster medium. We argue that this latter, intriguing, hypothesis mightbe tested by applying this technique to a low redshift large mass clustersample.

Cross-correlating the gamma-ray sky with catalogs of galaxy clusters