The Contribution of Quasar Absorption Outflows to AGN Feedback
  Determining the distance of quasar absorption outflows from the central
source (R) and their kinetic luminosity are crucial for understanding their
contribution to active galactic nucleus (AGN) feedback. Here we summarize the
results for a sample of nine luminous quasars that were observed with the
Hubble Space Telescope. We find that the outflows in more than half of the
objects are powerful enough to be the main agents for AGN feedback, and that
most outflows are found at R>100 pc. The sample is representative of the quasar
absorption outflow population as a whole and is unbiased towards specific
ranges of R and kinetic luminosity. Therefore, the analysis results can be
extended to the majority of such objects, including broad absorption line
quasars. We find that these results are consistent with those of another sample
(seven quasars) that is also unbiased towards specific ranges of R and kinetic
luminosity. Assuming that all quasars have absorption outflows, we conclude
that most luminous quasars produce outflows that can contribute significantly
to AGN feedback. We also discuss the criterion for whether an outflow is
energetic enough to cause AGN feedback effects.
