Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2011-03-02
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
6 pages, 1 figures, Contribution to the 10th European VLBI Network Symposium and EVN Users Meeting: VLBI and the new generatio
Scientific paper
We present here our results on 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 found that also radio loud BCGs have core structures very complex (e.g. 4C 26.42 in Abell 1795). Moreover, we noted a possible dichotomy between BCGs in cool-core clusters and those in non-cool-core clusters. Among resolved sources, those in cool-core clusters tend to have two-sided parsec scale jets, while those in less relaxed clusters have predominantly one-sided parsec scale jets. We suggest that this difference is caused by the interplay between the jets and the surrounding medium. Evidence of recurrent activity is also found in BCGs in cool-core clusters. For two peculiar cases of BCGs (IC 712 in Abell 1314 and NGC 6047 in Abell 2151) we asked and obtained new VLBA observations a 1.6 GHz. We discuss them here for the first time.
Giovannini Gabriele
Giroletti Marcello
Liuzzo Elisabetta
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