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We present a multiwavelength study of RXC J2014.8-2430, the most extremecool-core cluster in the Representative $XMM-Newton$ Cluster Structure Survey(REXCESS), using $Chandra$ X-ray, Southern Astrophysical Research (SOAR)Telescope, Atacama Large Millimeter/submillimeter Array (ALMA), Very LargeArray (VLA), and Giant Metrewave Radio Telescope (GMRT) observations. Whilefeedback from an active galactic nucleus (AGN) is thought to be the dominantmechanism by which a cooling flow is suppressed, the $Chandra$ imagingobservations surprisingly do not reveal the bi-lateral X-ray cavities expectedin the intracluster medium (ICM) of an extreme cool core hosting a powerfulradio source. We discuss the limits on the presence of any radio bubblesassociated with any undetected X-ray cavities. We place upper limits on anysignificant X-ray AGN in the brightest cluster galaxy, and show that the X-raypeak is offset from the central radio source, which exhibits a steep lowfrequency radio spectrum indicative of electron ageing. The SOAR data reveal anextended, luminous emission line source. From our narrowband H$\alpha$ imagingof the BCG, the central H$\alpha$ peak is coincident with the radioobservations, yet offset from the X-ray peak, consistent with sloshing foundpreviously in this cluster. ALMA observations reveal a large reservoir ofmolecular gas that traces the extended H$\alpha$ emission. We conclude eitherthat the radio source and its cavities in the X-ray gas are nearly alignedalong the line of sight, or that ram pressure induced by sloshing hassignificantly displaced the cool molecular gas feeding it, perhaps preemptingthe AGN feedback cycle. We argue that the sloshing near the core is likelysubsonic, as expected, given the co-location of the H$\alpha$, CO(1-0), radiocontinuum, and stellar emission peaks and their proximity to the intact coolcore seen in X-ray.

The strongest cool core in REXCESS: Missing X-ray cavities in RXC J2014.8-2430