  Chandra and XMM-Newton X-ray observations are accumulating evidence for
massive, high velocity outflows in Seyfert galaxies and quasars, most likely
originating very close to the central supermassive black hole. These results
are offering new potential to probe the launching regions of relativistic
jets/outflows, and to quantify their feedback impact on the host galaxy and/or
cluster of galaxies. The most important signature of these phenomena is the
detection of blueshifted absorption lines of highly ionized iron at energies
usually greater than ~7 keV. The lack of sensitivity of present day X-ray
observatories at these energies gives rise to bias against the detection of
more ``extreme'' outflows, with highest velocity and ionization, which would be
blueshifted at energies >10 keV. Thus, simulations with Simbol-X were carried
out to test its capability of detecting absorption lines/edges between 5-20
keV, in order to probe the dynamics (i.e. measurement of velocity variations)
of the absorbing gas, as well as the highest (up to relativistic speeds)
velocity and ionization components. We found that the unprecedented sensitivity
of Simbol-X between 5-30 keV is a great opportunity to obtain important
improvements in this research field.
