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Looking at the region connecting two clusters is a promising way to identify and study the Warm?Hot Intergalactic Medium. Observations show that the spectrum of the bridge between A3556 and A3558 has a stronger soft X-ray emission than the nearby region. Suzaku?observations could not discriminate the origin of the extra emission. In this work we analyze a dedicated Chandra?observation of the same target to identify point sources and characterize the background emission in the bridge. We find that the count number of the point sources is much higher than average field population (using CDFS 4 Ms as a reference). Moreover, the shape of the cumulative distribution resembles that of galaxy distribution suggesting that the point sources are galaxies in a filament. The Suzaku?extra emission is well explained by the high abundance of point sources identified by Chandra. Furthermore, we used optical/IR observations of point sources in the same field to estimate the density of the putative filament as , below Suzaku?sensitivity.

EXPLORING THE BRIDGE BETWEEN A3556 AND A3558 IN THE SHAPLEY SUPERCLUSTER