| Abstract |
In massive galaxies the small scale property of black hole mass correlates
with the 100.000.000 times larger scale properties of bulge mass, velocity
dispersion and luminosity. This is generally interpreted as a long-term
co-evolution of galaxies and their central black holes over cosmic times,
with a self-regulating "feedback" loop governing the abundance of gas
available for black hole growth and star formation. I will review the
actual evidence for co-evolution and feedback and analyse how direct or
indirect this co-evolution is or has to be, and whether there are
alternative explanations for these intriguing scaling relations of
galaxies and black holes.
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