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We present the results of a multiwavelength investigation of the very X-rayluminous galaxy cluster MACSJ0553.4-3342 ($z = 0.4270$; hereafter MACSJ0553).Combining high-resolution data obtained with the Hubble Space Telescope and theChandra X-ray Observatory with ground-based galaxy spectroscopy, our analysisestablishes the system unambiguously as a binary, post-collision merger ofmassive clusters. Key characteristics include perfect alignment of luminous anddark matter for one component, a separation of almost 650 kpc (in projection)between the dark-matter peak of the other subcluster and the second X-ray peak,extremely hot gas (k$T > 15$ keV) at either end of the merger axis, a potentialcold front in the east, an unusually low gas mass fraction of approximately0.075 for the western component, a velocity dispersion of $1490_{-130}^{+104}$km s$^{-1}$, and no indication of significant substructure along the line ofsight. We propose that the MACSJ0553 merger proceeds not in the plane of thesky, but at a large inclination angle, is observed very close to turnaround,and that the eastern X-ray peak is the cool core of the slightly less massivewestern component that was fully stripped and captured by the easternsubcluster during the collision. If correct, this hypothesis would makeMACSJ0553 a superb target for a competitive study of ram-pressure stripping andthe collisional behaviour of luminous and dark matter during cluster formation.

Fully stripped? The dynamics of dark and luminous matter in the massive cluster collision MACSJ0553.4$-$3342