We use multifrequency, multiepoch VLBA observations to pinpoint the center of activity (or "core") in five compact symmetric objects (CSOs) and one candidate CSO from the Pearson-Readhead sample. We provide a first identification of the core component in two sources, and we have discovered that the cores of the objects 0108+388 and 2352+495 were previously misidentified. The precise location of the central engine in CSOs is crucially important for understanding their interaction with the surrounding environment and their evolution. All six objects studied here are found to display considerable asymmetry in their jets, especially near the core. The likely cause of this asymmetry is differences in density of the surrounding medium.
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Taylor et al. (1996) studied this question.