Searching for clues of past binary supermassive black hole mergers in nuclear star clusters

Abstract Galaxy mergers are common processes in the Universe. As a large fraction of galaxies hosts at their centres central supermassive black hole (SMBH), can lead to formation binary (SMBHB). The such is more efficient when SMBHs embedded nuclear star cluster (NSC). NSCs dense and massive stellar clusters present majority observed galaxies. Their densities reach up 107 M⊙/pc3 masses be as few M⊙. direct detection an SMBHB observationally challenging. In this work, we illustrate how scale structural dynamical properties NSC help identify nucleated that recently went through merger possibly led SMBHB. Our models show imprint signatures on shape, density profile, rotation velocity structure NSC. strength depends mass ratio between orbital initial conditions merger. addition, number hypervelocity stars produced linked properties. also contribute disc galaxy.