The 2dF QSO redshift survey and the history of cosmological accretion

Lance Miller (Oxford University)

It seems likely that hierarchical mergers drive AGN and QSO formation and evolution, but it is also clear that merger rate alone cannot explain the very rapid evolution in high-luminosity QSO space density, nor can it explain the very different form of evolution found for low luminosity X-ray selected AGN. Here we discuss the ingredients that are necessary to understand AGN formation, showing new results from the 2dF QSO survey on the mass of the cosmic structures inhabited by QSOs. We add new theoretical work arguing that supermassive black holes grow coevally with their galaxies and show how the mean Eddington ratio of black hole accretion evolves with cosmic epoch.

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