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{We present, for the first time, photometric and kinematical evidence,obtained with FORS2 on the VLT, for the existence of kinematically decoupledcores (KDCs) in two dwarf elliptical galaxies; FS76 in the NGC5044 group andFS373 in the NGC3258 group. Both kinematically peculiar subcomponents rotate inthe same sense as the main body of their host galaxy but betray their presenceby a pronounced bump in the rotation velocity profiles at a radius of about 1".The KDC in FS76 rotates at 10+/-3km/s, with the host galaxy rotating at15+/-6km/s; the KDC in FS373 has a rotation velocity of 6+/-2km/s while thegalaxy itself rotates at 20+/-5km/s. FS373 has a very complex rotation velocityprofile with the velocity changing sign at 1.5 R_e. The velocity and velocitydispersion profiles of FS76 are asymmetric at larger radii. This could becaused by a past gravitational interaction with the giant elliptical NGC5044,which is at a projected distance of 50kpc. We argue that these decoupled coresare most likely not produced by mergers in a group or cluster environmentbecause of the prohibitively large relative velocities. A plausible alternativeis offered by flyby interactions between a dwarf elliptical or its diskyprogenitor and a massive galaxy. The tidal forces during an interaction at therelative velocities and impact parameters typical for a group environment exerta torque on the dwarf galaxy that, according to analytical estimates, transfersenough angular momentum to its stellar envelope to explain the observedpeculiar kinematics.Comment: 11 pages, 14 figures, accepted for publication in A&

Dwarf elliptical galaxies with kinematically decoupled cores