Poster Title: The ISM of Ellipticals and Black Hole Evolution
Abstract: The interstellar matter (ISM) of elliptical bulges undergoes a dramatic evolution after the initial star burst. Gas is mainly injected by normal stellar evolution with an injection rate decreasing with time. Gas injection was about a factor 100 higher at redshift 3-5. Energy is injected mainly by SNe Ia and dissipation of kinetic stellar energy. These two facts forbid any hydrostatic solution for the ISM distribution and lead either to bulge winds or cooling flows. We discuss possible scenarios for the formation of dusty tori on the parsec--scale and their fuelling rates.
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