# High resolution spectroscopy of the extended narrow-line region of IC 5063 and NGC 7212

## TL;DR

This study uses high-resolution spectroscopy to analyze the gas properties of the extended narrow-line regions in two Seyfert 2 galaxies, revealing the roles of shocks and photo-ionization, and suggesting complex gas kinematics influenced by jets.

## Contribution

It provides new insights into the ionization mechanisms and gas kinematics of ENLR in IC 5063 and NGC 7212 using high-resolution spectral analysis and composite shock-photo-ionization models.

## Key findings

- Shocks significantly contribute to gas ionization at high velocities.
- IC 5063 shows a velocity-dependent ionization parameter consistent with a bi-conical ENLR.
- Gas clouds exhibit high fragmentation, indicating complex interactions with jets.

## Abstract

We studied the properties of the gas of the extended narrow line region (ENLR) of two Seyfert 2 galaxies: IC 5063 and NGC 7212. We analysed high resolution spectra to investigate how the main properties of this region depend on the gas velocity. We divided the emission lines in velocity bins and we calculated several line ratios. Diagnostic diagrams and SUMA composite models (photo-ionization + shocks), show that in both galaxies there might be evidence of shocks significantly contributing in the gas ionization at high |V|, even though photo-ionization from the active nucleus remains the main ionization mechanism. In IC 5063 the ionization parameter depends on V and its trend might be explained assuming an hollow bi-conical shape for the ENLR, with one of the edges aligned with the galaxy disk. On the other hand, NGC 7212 does not show any kind of dependence. The models show that solar O/H relative abundances reproduce the observed spectra in all the analysed regions. They also revealed an high fragmentation of the gas clouds, suggesting that the complex kinematics observed in these two objects might be caused by interaction between the ISM and high velocity components, such as jets.