Recent general relativistic simulations have
shown that the coalescence of two spinning black holes (BH)
can lead to recoiling speeds of the BH remnant of up to thou-
sands of km/s as a result of the gravitational radiation emis-
sion. It is important that the accretion disc remains bound to
ejected BH within the region where the gas orbital velocity
is larger than the ejection speed. We considered the situation
when the recoiling kick radius coincides with the radius of
the broad line region (BLR). We show that in this situation
the observed polarization data of accretion disk emission al-
low to determine the value of the recoil velocity. We present
the estimates of the kick velocity for AGN with determined
polarization data.

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• Constraining recoiling velocities of black holes ejected by gravitational radiation in galaxy mergers