The mass ratio distribution of MBH binaries in the hierarchical model

摘要: We present different mass ratio distributions of massive black hole (MBH) binaries due to mechanisms involved in binary evolution. A system MBHs forms after the merger two galaxies, which has three stages: dynamical friction stage, stellar scattering or circumbinary disk and gravitational radiation stage. The second stage was once believed be “final parsec problem” (FPP) as stalled at this because depletion stars. Now, FPP been shown no longer a problem. Here we get MBH under mechanisms, interaction. For mechanism, assume that shrinks by interaction with holes (Bhs) have accretion rates simulation. apply simple assumption hierarchical coevolution model dark matter halos, find there will more equal-mass final coalescence for case where mechanism operates. This is mainly secondary BH accretes higher rate than primary one.