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We present Chandra and XMM-Newton observations of PLCK G036.7+14.9 from theChandra-Planck Legacy Program. The high resolution X-ray observations revealtwo close subclusters, G036N and G036S, which were not resolved by previousROSAT, optical, or recent Planck observations. We perform detailed imaging andspectral analyses and use a simplified model to study the kinematics of thissystem. The basic picture is that PLCK G036.7+14.9 is undergoing a major merger(mass ratio close to unity) between the two massive subclusters, with themerger largely along the line-of-sight and probably at an early stage. G036Nhosts a small, moderate cool-core, while G036S has at most a very weakcool-core in the central 40 kpc region. The difference in core cooling times isunlikely to be caused by the ongoing merger disrupting a pre-existing cool-corein G036S. G036N also hosts an unresolved radio source in the center, which maybe heating the gas if the radio source is extended. The Planck derived mass ishigher than the X-ray measured mass of either subcluster, but is lower than theX-ray measured mass of the whole cluster, due to the fact that Planck does notresolve PLCK G036.7+14.9 into subclusters and interprets it as a singlecluster. This mass discrepancy could induce significant bias to the massfunction if such previously unresolved systems are common in the Planck clustersample. High resolution X-ray observations are necessary to identify thefraction of such systems and correct such a bias for the purpose of precisioncosmological studies.

Chandra and XMM-Newton observations of the merging cluster of galaxies PLCK G036.7+14.9