  We present binary galaxy merger simulations of gas-rich disks (Sp-Sp), of
early-type galaxies and disks (E-Sp, mixed mergers), and mergers of early-type
galaxies (E-E, dry mergers) with varying mass ratios and different progenitor
morphologies. The simulations include radiative cooling, star formation and
black hole (BH) accretion and the associated feedback processes. We find for
Sp-Sp mergers, that the peak star formation rate and BH accretion rate decrease
and the growth timescales of the central black holes and newly formed stars
increase with higher progenitor mass ratios. The termination of star formation
by BH feedback in disk mergers is significantly less important for higher
progenitor mass ratios (e.g. 3:1 and higher). In addition, the inclusion of BH
feedback suppresses efficiently star formation in dry E-E mergers and mixed
E-Sp mergers.
