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We present new constraints on the merger history of the most X-ray luminouscluster of galaxies, RXJ1347.5-1145, based its unique multiwavelengthmorphology. Our X-ray analysis confirms the core gas is undergoing "sloshing"resulting from a prior, large scale, gravitational perturbation. In combinationwith extensive multiwavelength observations, the sloshing gas points to theprimary and secondary clusters having had at least two prior stronggravitational interactions. The evidence supports a model in which thesecondary subcluster with mass M=4.8$\pm2.4 \times$ 10$^{14}$ M$_{\odot}$ haspreviously ($\gtrsim$0.6 Gyr ago) passed by the primary cluster, and has nowreturned for a subsequent crossing where the subcluster's gas has beencompletely stripped from its dark matter halo. RXJ1347 is a prime example ofhow core gas sloshing may be used to constrain the merger histories of galaxyclusters through multiwavelength analyses.

Sloshing Gas in the Core of the Most Luminous Galaxy Cluster RXJ1347.5-1145