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We present results from Chandra, XMM-Newton, and ROSAT observations of thePlanck SZ-detected cluster A3716 (PLCKG345.40-39.34 - G345). We show that G345is, in fact, two subclusters separated on the sky by 400 kpc. We measure thesubclusters' gas temperatures (~ 2-3 keV), total (~ 1-2 x 10^14 solar masses)and gas (~ 1-2 x 10^13 solar masses) masses, gas mass fraction within r500,entropy profiles, and X-ray luminosities (~ 10^43 erg/s). Using the gas densityand temperature profiles for both subclusters, we show that there is good (0.8sigma) agreement between the expected Sunyaev-Zel'dovich signal predicted fromthe X-ray data and that measured from the Planck mission, and better agreementwithin 0.6 sigma when we re-computed the Planck value assuming a two componentcluster model, with relative amplitudes fixed based on the X-ray data.Dynamical analysis shows that the two galaxy subclusters are very likely (> 97%probability) gravitationally bound, and in the most likely scenario, thesubclusters will undergo core passage in 500 +- 200 Myr. The northernsubcluster is centrally peaked and has a low entropy core, while the southernsubcluster has a high central entropy. The high central entropy in the southernsubcluster can be explained either by the mergers of several groups, assuggested by the presence of five giant ellipticals or by AGN energy injection,as suggested by the presence of a strong radio source in one of its massiveelliptical galaxies, or by a combination of both processes.

Chandra and XMM-Newton Observations of the Bimodal Planck SZ-detected Cluster PLCKG345.40-39.34 (A3716) with High and Low Entropy Subcluster Cores