Parsec scale jets in Brightest Cluster Galaxies .

We present a statistically study of parsec scale properties of a complete sample of Brightest Cluster Galaxies (BCGs) in nearby Abell Clusters (distance class <3). Combined with data from the literature, we provide parsec scale information for 34 BCGs. We find a possible dichotomy between BCGs in cool-core clusters (two-sided parsec scale jets) and those in non-cool-core clusters predominantly one-sided parsec scale jets). We suggest that this difference is caused by the interplay between the jets and the surrounding medium. The one-sided structure in non-cool-core clusters may be due to Doppler boosting effects in relativistic, intrinsically symmetric jets whereas two-sided morphology in cool core clusters is probably related to the presence of heavy and mildly relativistic jets that have been decelerated on the parsec scale. Evidence of recurrent activity is also found in BCGs in cool-core