摘要: During the final moments of a binary black hole (BH) merger, gravitational wave (GW) luminosity system is greater than combined electromagnetic (EM) output entire observable universe. However, extremely weak coupling between GWs and ordinary matter makes these waves very difficult to detect directly. Fortunately, inspiraling BH will interact strongly—on purely Newtonian level—with any surrounding material in host galaxy, this can turn produce unique EM signals detectable at Earth. By identifying counterparts GW sources, we be able study environments merging BHs, greatly expanding scientific yield mission like LISA. Here present comprehensive review recent literature on subject counterparts, as well discussion theoretical observational advances required fully realize potential field.