2006ApJ...651..767M

We study the influence of a galactic central supermassive black hole (SMBH) binary on gas dynamics and star formation activity in a nuclear gas disk with three-dimensional tree+SPH simulations. Because of the orbital motions of the SMBHs, there are various resonances between the gas motion and SMBH binary motion. We show that these resonances create characteristic structures of gas in the nuclear gas disk, for example, elongated or filament structures, gaseous spiral arms, and/or small gas disks around the SMBHs. In these dense gaseous regions, active star formation is induced, and as a result, many starbursts are formed in the nuclear region.