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We perform a combined X‐ray and strong lensing analysis of RX J1347.5−1145, one of the most luminous galaxy clusters at X‐ray wavelengths. We show that evidence from strong lensing alone, based on published Very Large Telescope (VLT) and new  Hubble Space Telescope  ( HST ) data, strongly argues in favour of a complex structure. The analysis takes into account arc positions, shapes and orientations, and is done thoroughly in the image plane. The cluster inner regions are well fitted by a bimodal mass distribution, with a total projected mass of   M  tot = (9.9 ± 0.3) × 10 14  M ⊙   h  −1   within a radius of 360 kpc  h  −1  (1.5 arcmin). Such a complex structure could be a signature of a recent major merger as further supported by X‐ray data. A temperature map of the cluster, based on deep  Chandra  observations, reveals a hot front located between the first main component and an X‐ray emitting south‐eastern subclump. The map also unveils a filament of cold gas in the innermost regions of the cluster, most probably a cooling wake caused by the motion of the cD inside the cool core region. A merger scenario in the plane of the sky between two dark matter subclumps is consistent with both our lensing and X‐ray analyses, and can explain previous discrepancies with mass estimates based on the virial theorem.

The dynamical state of RX J1347.5−1145 from a combined strong lensing and X‐ray analysis