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Powerful outflows are thought to play a critical role in galaxy evolution andblack hole growth. We present the first large-scale systematic study of ionisedoutflows in paired galaxies and post-mergers compared to a robust controlsample of isolated galaxies. We isolate the impact of the merger environment todetermine if outflow properties depend on merger stage. Our sample contains$\sim$4,000 paired galaxies and $\sim$250 post-mergers in the local universe($0.02 \leq z \leq 0.2$) from the SDSS DR 7 matched in stellar mass, redshift,local density of galaxies, and [OIII] $\lambda$5007 luminosity to a controlsample of isolated galaxies. By fitting the [OIII] $\lambda$5007 line, we findionised outflows in $\sim$15 per cent of our entire sample. Outflows are muchrarer in star-forming galaxies compared to AGN, and outflow incidence andvelocity increase with [OIII] $\lambda$5007 luminosity. Outflow incidence issignificantly elevated in the optical+mid-infrared selected AGN compared topurely optical AGN; over 60 per cent show outflows at the highest luminosities($L_{\mathrm{[OIII] \lambda5007}}$ $\gtrsim$ 10$^{42}$ erg s$^{-1}$),suggesting mid-infrared AGN selection favours galaxies with powerful outflows,at least for higher [OIII] $\lambda$5007 luminosities. However, we find nostatistically significant difference in outflow incidence, velocity, andluminosity in mergers compared to isolated galaxies, and there is no dependenceon merger stage. Therefore, while interactions are predicted to drive gasinflows and subsequently trigger nuclear star formation and accretion activity,when the power source of the outflow is controlled for, the merging environmenthas no further impact on the large-scale ionised outflows as traced by [OIII]$\lambda5007$.

Galaxy Pairs in the Sloan Digital Sky Survey XV: Properties of Ionised Outflows