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Detection of electromagnetic (EM) counterparts of pre-coalescence binarieshas very important implications for our understanding of the evolution of thesesystems as well as the associated accretion physics. In addition, a combinationof EM and gravitational wave signatures observed from coalescing supermassiveblack hole binaries (SBHBs) would provide independent measurements of redshiftand luminosity distance, thus allowing for high precision cosmologicalmeasurements. However, a statistically significant sample of these objects isyet to be attained and finding them observationally has proven to be adifficult task. Here we discuss existing observational evidence and how furtheradvancements in the theoretical understanding of observational signatures ofSBHBs before and after the coalescence can help in future searches.

Emission Lines as a Tool in Search for Supermassive Black Hole Binaries and Recoiling Black Holes