High frequency peakers
M. Orienti
Istituto di Radioastronomia – INAF, Via Gobetti 101, I-40129 Bologna, Italy
Search for more papers by this authorM. Orienti
Istituto di Radioastronomia – INAF, Via Gobetti 101, I-40129 Bologna, Italy
Search for more papers by this authorAbstract
High Frequency Peaker (HFP) radio sources are an extreme class of active galactic nuclei whose nature has not been fully understood yet. They are compact objects with a simple convex radio spectrum which turns over at frequencies well above a few GHz. In the context of evolutionary models such sources are likely to represent the earliest stage in individual radio source evolution, with typical ages of a few hundred years. However, the selection tools used to identify a source as an HFP are based on the spectral shape and can introduce a contamination by beamed blazar objects. The study of their radio properties provides us with important information on their nature and on the ambient medium in which they are evolving (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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