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The most luminous quasars are created by major, gas-rich mergers andE1821+643, an optically luminous quasar situated at the center of a cool-corecluster, appears to be in the late stages of the post-merger blowout phase.This quasar is also identified as a gravitational recoil candidate, in whichthe supermassive black hole (SMBH) has received a recoil kick due toanisotropic emission of gravitational waves during the coalescence of aprogenitor SMBH binary. We analyze long-slit spectra of the extended, ionizedgas surrounding E1821+643 to study its kinematics and ionization. We haveidentified three kinematically distinct components, which we associate,respectively, with a wide-angle polar wind from the nucleus, kinematicallyundisturbed gas, and a redshifted arc-like structure of gas, at a distance of3-4\arcsec~(13-18 kpc) from the nucleus. The latter component coincides withthe northern and eastern extremities of an arc of [OIII] emission seen in HSTimages. This feature could trace a tidal tail originating from a merger with agas-rich galaxy to the South-East of the nucleus, whose presence has beeninferred by Aravena et al. from the detection of CO emission. Alternatively,the arc could be the remnant of a shell of gas swept-up by a powerful quasarwind. The emission line ratios of the extended gas are consistent withphotoionization by the quasar, but a contribution from radiative shocks cannotbe excluded.

The Kinematics and Ionization Structure of the Extended Emission Line Region of QSO E1821+643