The origin of the relationship between black hole mass and host galaxy bulge luminosity

摘要

There is a strong decrease in scatter in the black hole mass versus bulgeluminosity relationship with increasing luminosity and very little scatter forthe most luminous galaxies. It is shown that this is a natural consequence ofthe substantial initial dispersion in the ratio of black hole mass to totalstellar mass and of subsequent galaxy growth through hierarchical mergers."Fine-tuning" through feedback between black hole growth and bulge growth isneither necessary nor desirable.