Mapping Seyfert and LINER Excitation Modes in the Inner kpc of NGC 3393
  We have mapped the extended narrow line region (ENLR) of NGC 3393 on scales
of $r\lesssim4^{\prime\prime}$ ($\sim1\,$kpc) from the nucleus using emission
line images of H$\alpha\,\lambda6563$, [O III]$\lambda5007$, and [S
II]$\lambda\lambda6717,6731$ taken with HST as part of the CHandra survey of
Extended Emission line Regions in nearby Seyfert galaxies (CHEERS). By mapping
these lines onto a spatially resolved Baldwin-Phillips-Terlevich (BPT) diagram,
we investigate the impact of feedback from a Compton-thick AGN on its
circumnuclear ISM. We find the expected Seyfert-like emission within the
ionization bicone ($\lesssim3^{\prime\prime}$; 770 pc). We also find a new,
figure 8 shaped LINER cocoon enveloping the bicone and defining a sharp
($\lesssim100\;$pc) transition between higher and lower ionization zones. These
data illustrate the morphological dependence of ionization states of the ENLR
relative to bicone and host gas geometries.
