Evidence for quasar fast outflows being accelerated at the scale of tens
  of parsecs
  Quasar outflows may play a crucial role in regulating the host galaxy,
although the spatial scale of quasar outflows remain a major enigma, with their
acceleration mechanism poorly understood. The kinematic information of outflow
is the key to understanding its origin and acceleration mechanism. Here, we
report the galactocentric distances of different outflow components for both a
sample and an individual quasar. We find that the outflow distance increases
with velocity, with a typical value from several parsecs to more than one
hundred parsecs, providing direct evidence for an acceleration happening at a
scale of the order of 10 parsecs. These outflows carry ~1% of the total quasar
energy, while their kinematics are consistent with a dust driven model with a
launching radius comparable to the scale of a dusty torus, indicating that the
coupling between dust and quasar radiation may produce powerful feedback that
is crucial to galaxy evolution.
