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As a powerful source of gravitational waves (GW), a supermassive black hole(SMBH) merger may be accompanied by a relativistic jet that leads to detectableelectromagnetic (EM) emission. We model the propagation of post-merger jetsinside a pre-merger circumnuclear environment formed by disk winds, andcalculate multi-wavelength EM spectra from the forward shock region. We showthat the non-thermal EM signals from SMBH mergers are detectable up to thedetection horizon of future GW facilities such as the Laser InterferometerSpace Antenna (LISA). Calculations based on our model predict slowly fadingtransients with time delays from days to months after the coalescence, leadingto implications for EM follow-up observations after the GW detection.

Post-Merger Jets from Supermassive Black Hole Coalescences as Electromagnetic Counterparts of Gravitational Wave Emission