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Galaxies accrete material from the environment through acquisition andmerging events. We study the nearby S0 galaxy IC 5181 to address the origin ofthe ionized-gas component orbiting the galaxy on polar orbit ionized gas of IC5181 from broad and narrow-band imaging. We measure the ionized-gas and stellarkinematics and the line strengths of the Lick indices of the stellar componentalong both the major and minor axis. The age, metallicity, and [alpha/Fe]enhancement of the stellar populations are derived using single stellarpopulation models with variable element abundance ratios. The ionized-gasmetallicity is obtained from the equivalent width of the emission lines. IC5181 is a morphologically undisturbed S0 galaxy with a classical bulge made byold stars with super solar metallicity and overabundance. Stellar age andmetallicity decrease in the disk region. The galaxy hosts a geometrically andkinematically decoupled component of ionized gas. It is elongated along thegalaxy minor axis and in orthogonal rotation with respect to the galaxy disk.We interpret the kinematical decoupling as suggestive of a component of gas,which is not related to the stars and having an external origin. It wasaccreted by IC 5181 on polar orbits from the surrounding environment.

The external origin of the polar gaseous disk of the S0 galaxy IC 5181