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In this study, we examine photoionization outflows during the late stages ofgalaxy mergers, with a specific focus on the relation between observed velocityof outflowing gas and the apparent effects of dust extinction. We used theN-body/smoothed particle hydrodynamics (SPH) code ASURA for galaxy mergersimulations. These simulations concentrated on identical galaxy mergersfeaturing supermassive black holes (SMBHs) of 10$^8$ M$_\odot$ and gasfractions of 30\% and 10 \%. From the simulation data, we derived velocity andvelocity dispersion diagrams for the AGN-driven ionized outflowing gas. Ourfindings show that high-velocity outflows with velocity dispersions of 500 kms$^{-1}$ or greater can be observed in the late stages of galactic mergers.Particularly, in buried AGNs, both the luminosity-weighted outflow velocity andvelocity dispersion increase owing to the apparent effects of dust extinction.Owing to these effects, the velocity--velocity dispersion diagrams display anoticeable blue-shifted tilt in models with higher gas fractions. Crucially,this tilt is not influenced by the AGN luminosity but emerges from theobservational impacts of dust extinction. Our results imply that the observedhigh-velocity \OIII outflow exceeding 1000 km s$^{-1}$ in buried AGNs may belinked to the dust extinction that occurs during the late stages of gas-richgalaxy mergers.

Apparent effect of dust extinction on the observed outflow velocity of ionized gas in galaxy mergers