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We present and discuss Hα+[N II] imaging observations of fifteen nearby elliptical and S0 galaxies with extended optical emission lines. The morphology of the emitting regions suggests that the ionized gas usually lies in a disk which is often geometrically decoupled from the stellar body, as expected in a triaxial galaxy. The presence of a gaseous disk makes these galaxies suitable for testing their gravitational field in a straightforward way. The presence of dust in many of the disks, together with the observed morphological properties, suggests that the ionized gas in most of these galaxies is more closely associated with the cold ISM than with the hot X-ray component

The distribution of ionized gas in early-type galaxies. II. The velocity field of the ionized gas