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We present the results of integral field spectroscopy of the gravitationalwave (GW) recoiling black hole candidate 3C 186. The goal of the observationsis to study the kinematics of the [OIII]5007 narrow emission line region (NLR)of the quasar, and investigate the origin of the velocity offsets originallymeasured for different UV lines. The results show that i) the spatial structureof the NLR is complex. The [OIII]5007 line shows significant velocity offsetswith respect to the systemic redshift of the source. Different components atdifferent velocities (-670, -100, + 75 km s^-1) are produced in differentregions of the source. ii) we detect both the narrow and the broad componentsof the Hbeta line. The narrow component generally follows the kinematics of the[OIII] line, while the broad component is significantly blue-shifted. The peakof the broad line is near the blue end, or possibly outside of the sensitivityband of the instrument, implying a velocity offset of >~1800 km s^-1. Thisresult is in agreement with the interpretation of the QSO as a GW recoilingblack hole. The properties of the NLR show that the observed outflows are mostlikely the effect of radiation pressure on the (photoionized) gas in theinterstellar medium of the host galaxy.

The recoiling black hole candidate 3C 186: spatially-resolved quasar feedback and further evidence of a blue-shifted broad line region