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The Stephan's Quintet (SQ) is a famous interacting compact group of galaxiesin an important stage of dynamical evolution, but surprisingly very fewspectroscopic studies are found in the literature. We present optical integralfield spectroscopy (IFS) observations of the SQ from the PPAK IFS NearbyGalaxies Survey (PINGS), that provide a powerful way of studying with spatialresolution the physical characteristics of the ionized gas within the group.The nature of the gas emission is analysed using 2D maps ofcontinuum-subtracted, pure emission-line intensities, stacked spectra,diagnostic diagrams, and photoionization model predictions. In the case of NGC7319, we study the galaxy-wide high-velocity outflow emission by comparing theemission properties with theoretical shock and AGN models. We conclude that theexcitation mechanism of the gas in this galaxy is a mixture of AGNphotoionization and shocks with a photoionizing precursor. The emission spectrafrom the large scale shock front in the interacting pair NGC 7318A/B isanalysed, confirming the presence of several kinematic components. Comparisonwith predictions from theoretical shock models suggests that the gas emissionis consistent with shocks without a photoionizing precursor, low pre-shockdensity, and velocities in the range of 200 - 400 km s-1. The gas oxygenabundance for NGC 7318B is determined using an updated O3N2 calibration.Although NGC 7317 shows no significant gas emission, an ionizing cluster isfound southwest of this galaxy, probably the result of tidal interaction. As aby-product, we analyse the gas emission of the foreground galaxy NGC 7320.

A study of the ionized gas in Stephan's Quintet from integral field spectroscopy observations