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The presence of blue cores in some dwarf early-type galaxies (dEs) in galaxyclusters suggests the scenario of late-type galaxy infall and subsequenttransformation into red, quiescent dEs. We present Gemini Multi-ObjectSpectrographs long-slit spectroscopy of two dEs with blue cores (dE(bc)s), EVCC591 and EVCC 516, located at the core and outskirt of the Virgo cluster,respectively. We obtained their internal kinematics along the major axis outto, at least, ~ 1 effective radius. EVCC 591 shows evidence of a kinematicallydecoupled core (KDC) with a size of 2" (160 pc), exhibiting an inverted patternfor velocity with respect to the main body of its host galaxy. The rotationcurve of the stellar component in the inner region of EVCC 591 is steeper thanthat in the rest of the galaxy. On the other hand, overall velocity profiles ofstellar and ionized gas components of EVCC 516 show no signature of significantrotation. The occurrence of a KDC and zero rotation in the internal kinematicsalong with the central star formation support the scenario of gas-richdwarf-dwarf mergers in the formation of these two dE(bc)s. Furthermore,evolution of dE(bc)s in a cluster environment into ordinary dEs with KDCs ispossible based on their structural properties. We suggest that at least some ofthe dE(bc)s in the Virgo cluster were formed through dwarf-dwarf mergers inlower density environments before they subsequently fell into the cluster; theywere then quenched by subsequent effects within the cluster environment.

Formation of Blue-cored Dwarf Early-type Galaxies in a Cluster Environment: a Kinematical Perspective