Multi-phase outflows as probes of AGN accretion history
  Powerful outflows with a broad range of properties (such as velocity,
ionization, radial scale and mass loss rate) represent a key feature of active
galactic nuclei (AGN), even more so since they have been simultaneously
revealed also in individual objects. Here we revisit in a simple analytical
framework the recent remarkable cases of two ultraluminous infrared quasars,
IRAS F11119+3257 and Mrk 231, which allow us to investigate the physical
connection between multi-phase AGN outflows across the ladder of distance from
the central supermassive black hole (SMBH). We argue that any major deviations
from the standard outflow propagation models might encode unique information on
the past SMBH accretion history, and briefly discuss how this could help
address some controversial aspects of the current picture of AGN feedback.
