A Giant Loop of Ionized Gas Emerging from the Tumultuous Central Region
  of IC 5063
  The biconical radiation pattern extending from an active galactic nucleus
(AGN) may strongly photoionize the circumnuclear interstellar medium (ISM) and
stimulate emission from the narrow line region (NLR). Observations of the NLR
may provide clues to the structure of dense material that preferentially
obscures the bicone at certain angles, and may reveal the presence of processes
in the ISM tied to AGN accretion and feedback. Ground-based integral field
units (IFUs) may study these processes via well-understood forbidden diagnostic
lines such as [O III] and [S II], but scales of $\sim10$s of pc remain
challenging to spatially resolve at these wavelengths for all but the nearest
AGN. We present recent narrow filter Hubble Space Telescope (HST) observations
of diagnostic forbidden ([O III], [S II]) and Balmer (H$\alpha$, H$\beta$)
lines in the NLR of IC 5063. This AGN's jet inclination into the plane of the
galaxy provides an important laboratory for strong AGN-host interactions. We
find evidence for a low-ionization loop which emits brightly in [S II] and [N
II], and which may arise from plume-like hot outflows that ablate ISM from the
galactic plane before escaping laterally. We also present spatially resolved
Baldwin-Phillips-Terlevich diagnostic maps of the IC 5063 NLR. These maps
suggest a sharp transition to lower-ionization states outside the jet path, and
that such emission is dominated by $\sim10-40$ pc clumps and filamentary
structure at large (>>25{\deg}) angles from the bicone axis. Such emission may
arise from precursorless shocks when AGN outflows impact low-density hot plasma
in the cross-cone.
