Suppressing hot gas accretion to supermassive black holes by stellar winds. (arXiv:1206.6029v1 [astro-ph.CO])

Suppressing hot gas accretion to supermassive black holes by stellar winds. (arXiv:1206.6029v1 [astro-ph.CO]):
We argue that one of the basic assumptions of the Bondi accretion process,
that the accreting object has zero pressure, might not hold in many galaxies
because of the pressure exerted by stellar winds of star orbiting the central
super massive black hole (SMBH). Hence, the Bondi accretion cannot be used in
these cases, such as in the galaxy NGC 3115. The winds of these high-velocity
stars are shocked to temperatures above the virial temperature of the galaxy,
leading to the formation of a hot bubble of size ~0.1-10 pc near the center.
This hot bubble can substantially reduce the mass accretion rate by the SMBH.
If the density of the hot bubble is lower than that of the interstellar medium
(ISM), a density-inversion layer is formed. Adding to other problems of the
Bondi process, our results render the Bondi accretion irrelevant for AGN
feedback in cooling flow in galaxies and small groups of galaxies and during
galaxy formation.