Maksym, W. Peter, Fabbiano, Giuseppina, Elvis, Martin, Karovska, Margarita, Paggi, Alessandro, Raymond, John, Wang, Junfeng, and Storchi-Bergmann, Thaisa. 2016. "Mapping Seyfert and LINER Excitation Modes in the Inner kpc of NGC 3393." The Astrophysical Journal 829:46. https://doi.org/10.3847/0004-637X/829/1/46
We mapped the extended narrowline region (ENLR) of NGC 3393 on scales of r? 4\prime\prime (~ 1 kpc) from the nucleus using emission line images of H? ?6563, [O iii]? 5007, and [S ii]? ? 6717,6731, taken with the Hubble Space Telescope 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 diagram, we investigate the impact of feedback from a Compton-thick active galactic nucleus on its circumnuclear ISM. We find that the expected Seyfert-like emission within the ionization bicone (? 3\prime\prime ; 770 pc). We also find a new, figure-8-shaped low ionization emission line region (LINER) cocoon enveloping the bicone and defining a sharp (? 100 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.