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Galaxy clusters are the largest virialized objects in the universe. Theirmerger dynamics and their interactions with the cosmic filaments that connectthem are important for our understanding of the formation of large-scalestructure. In addition, cosmic filaments are thought to possess the missingbaryons in the universe. Studying the interaction of galaxy clusters andfilaments therefore has the potential to unveil the the origin of the baryonsand the physical processes that occur during merger stages of galaxy clusters.In this paper, we study the connection between A3395 and the interclusterfilament with NuSTAR, XMM-Newton, and Suzaku data. Since the NuSTAR observationis moderately contaminated by scattered light, we present a novel techniquedeveloped for disentangling this background from the emission from theintracluster medium. We find that the interface of the cluster and theintercluster filament connecting A3395 and A3391 does not show any signs ofheated plasma, as was previously thought. This interface has low temperature,high density, and low entropy, thus we suggest that the gas is cooling, beingenhanced by the turbulent or tidal 'weather' driven during the early stage ofthe merger. Furthermore, our temperature results from the NuSTAR data are inagreement with those from XMM-Newton, and from joint NuSTAR and XMM-Newtonanalysis for a region with ~25% scattered light contamination within 1 sigma.We show that the temperature constraint of the intracluster medium is valideven when the data are contaminated up to ~25% for ~5 keV cluster emission.

The NuSTAR, XMM-Newton, and Suzaku view of A3395 at the intercluster filament interface