Nuclei of Seyfert galaxies and QSOs - Central engine and conditions of
  star formation. Workshop summary and open questions
  Observationally established correlations between black hole mass and host
galaxy structural/dynamical properties (like the M_BH - sigma relation) give
support to the idea of an intimate link between the growth of black holes (BHs)
and their host galaxies. Active galactic nuclei represent a poorly understood
phase (or phases) in the life of a galaxy, during which the BH growth is
directly observable. With the advent of wide-field surveys and high angular
resolution instruments, it is now possible to observe the source of energy in
Seyfert galaxies and QSOs, and conduct both statistical and detailed on-object
studies. Combining these two perspectives gives rise to new research questions
and methods. This Workshop, aimed at discussing these questions and gathering
the astronomical community working on AGN, their feeding and feedback
mechanisms, and their relations to the host galaxies. The purpose of this
summary paper is to condense in a few pages some of the ideas and discussion
points that were considered during the Workshop. We would also like to call the
attention to some open questions that are still matter of debate and drive the
research efforts in the field.
