NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-24 T05:40:08 PDT
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For refcode 2010A&A...516A...1L:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2010A&A...516A...1L Parsec-scale properties of brightest cluster galaxies Liuzzo, E.; Giovannini, G.; Giroletti, M.; Taylor, G. B. Abstract. We present new VLBI observations at 5 GHz 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. Our analysis of the parsec-scale radio emission of BCGs and the cluster X-ray properties finds 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. 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 clusters. Key words: galaxies: clusters: general, galaxies: nuclei, galaxies: jets, galaxies: structure, radio continuum: galaxies
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