Co-evolution of black holes and galaxies: the role of selection biases

摘要

Quasars are tracers of the cosmological evolution of the Black Hole mass - host galaxy relation, and indicate that the formation of BH anticipated that of the host galaxies. We find that selection effects and statistical biases dominate the interpretation of the observational results; and co-evolution (=constant BH/galaxy mass ratio) is still compatible with observations.