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Many Early-type galaxies (ETG) have ionized gas emission in their centresthat extends to scales of ~ 1kpc. The majority of such objects are classifiedas LINERs, but the nature of their ionizing source is still not clear. Thekinematics associated with these gaseous structures usually shows deviationsfrom a pure rotational motion due to non-gravitational effects or tonon-axisymmetric potentials. This is the third of a series of papers thatdescribes a sample of 10 nearby and massive ETG observed with the GeminiMulti-Object Spectrograph in Integral Field mode installed on the Gemini-Southtelescope. In paper II, we performed spectral synthesis to subtract the stellarcomponents from the data cubes of the sample galaxies in order to study theirnuclear spectra. Here, we analyse the circumnuclear gas emission (scales of ~100 pc) of the sample galaxies. Circumnuclear gas emission was detected inseven galaxies, all of them classified as LINERs. Pure gaseous discs are foundin three galaxies. In two objects, gaseous discs are probably present, buttheir kinematics are affected by non-Keplerian motions. In IC 5181, we detecteda spiral structure of gas that may be caused either by a non-axisymmetricpotential or by an outflow together with a gaseous disc. In NGC 3136, anionization bicone is present in addition to five compact structures withLINER-like emission. In galaxies with a gaseous disc, we found that ionizingphotons emitted by an AGN are not enough to explain the observed Ha flux alongthis structure. On the other hand, the Ha flux distribution and equivalentwidth along the direction perpendicular the gaseous disc suggest the presenceof low-velocity ionized gas emission which seem to be related to the nuclearactivity. We propose a scenario for LINER-like circumnuclear regions where alow-velocity ionization cone is formed by a collimating agent aligned with thegaseous disc.

IFU spectroscopy of 10 early-type galactic nuclei - III. Properties of the circumnuclear gas emission