Abstract
It is pointed out that turbulent pressure pulsations should be taken into account in the equation of state for the pressure in supersonic regimes. In the light of the celebrated α standard accretion disc model, it is shown that the structure and emission of the optically thin region of steady accretion discs in active galactic nuclei (AGN) may be drastically altered. It is shown that z-homogeneity is a very strong assumption that may lead to a solution with matter flowing back from the compact object. The solutions obtained are everywhere thermally unstable. It is also shown that temperatures in the range (1 - 5) × 103 yield masses quite different from the values usually assumed for quasars, unless a given relation between M and M˙ is used.
