  Outflows in the Active Galactic Nucleus (AGN) are considered to play a key
role in the host galaxy evolution through transfer of a large amount of energy.
A Narrow Line Region (NLR) in the AGN is composed of ionized gas extending from
pc-scales to kpc-scales. It has been suggested that shocks are required for
ionization of the NLR gas. If AGN outflows generate such shocks, they will
sweep through the NLR and the outflow energy will be transferred into a
galaxy-scale region. In order to study contribution of the AGN outflow to the
NLR-scale shock, we measure the
[\ion{Fe}{2}]$\lambda12570$/[\ion{P}{2}]$\lambda11886$ line ratio, which is a
good tracer of shocks, using near-infrared spectroscopic observations with
WINERED (Warm INfrared Echelle spectrograph to Realize Extreme Dispersion and
sensitivity) mounted on the New Technology Telescope. Among 13 Seyfert galaxies
we observed, the [\ion{Fe}{2}] and [\ion{P}{2}] lines were detected in 12 and 6
targets, respectively. The [\ion{Fe}{2}]/[\ion{P}{2}] ratios in 4 targets were
found to be higher than 10, which implies the existence of shocks. We also
found that the shock is likely to exist where an ionized outflow, i.e., a blue
wing in [\ion{S}{3}]$\lambda9533$, is present. Our result implies that the
ionized outflow present over a NLR-scale region sweeps through the interstellar
medium and generates a shock.
