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3C186 is a powerful radio loud quasar (QSO) at the center of a cool-corecluster at z=1.06. Previous studies reported evidence for a projected spatialoffset of ~1'' between the isophotal center of the galaxy and the point-sourceQSO as well as a spectral shift of ~2000 km/s between the narrow and broad lineregion of the system. In this work we report high-resolution molecular gasCO(4-3) observations of the system taken with NOEMA interferometer. We clearlydetect a large reservoir of molecular gas, $M_{H_2}\sim8\times10^{10}~M_\odot$,that is cospatial with the host galaxy and likely associated with a rotatingdisk-like structure. We firmly confirm both the spatial offset of the galaxy'sgas reservoir with respect to the continuum emission of the QSO and thespectral offset with respect to the redshift of the broad line region. Ourmorphological and kinematical analysis confirms that the most likely scenarioto explain the 3C186 system is that the QSO is a kicked super-massive blackhole (SMBH), which we believe may have resulted from a strong gravitationalwave recoil as two SMBHs coalesced after the merger of their host galaxies.

NOEMA observations support a recoiling black hole in 3C186