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We present ionized gas properties of 9 local ultra/luminous infrared galaxies(U/LIRGs) at $z <$ 0.04 through IFU observations with KOOLS-IFU on SeimeiTelescope. The observed targets are drawn from the Great Observatories All-skyLIRG Survey (GOALS), covering a wide range of merger stages. We successfullydetect emission lines such as H$\beta$, [OIII]$\lambda$5007, H$\alpha$,[NII]$\lambda\lambda$6549,6583, and [SII]$\lambda\lambda$6717,6731 with aspectral resolution of $R$ = 1500-2000, which provides (i) spatially-resolved($\sim$200-700 pc) moment map of ionized gas and (ii) diagnostics for activegalactic nucleus (AGN) within the central $\sim$3--11 kpc in diameter for oursample. We find that [OIII] outflow that is expected to be driven by AGN tendsto be stronger (i) towards the galactic center and (ii) as a sequence of mergerstage. In particular, the outflow strength in the late-stage (stage D) mergersis about 1.5 times stronger than that in the early-state (stage B) mergers,which indicates that galaxy mergers could induce AGN-driven outflow and play animportant role in the co-evolution of galaxies and supermassive black holes.

Optical IFU Observations of GOALS Sample with KOOLS-IFU on Seimei Telescope: Initial results of 9 U/LIRGs at $z <$ 0.04