Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..386..196o&link_type=abstract
Extragalactic Jets: Theory and Observation from Radio to Gamma Ray ASP Conference Series, Vol. 386, proceedings of the conferenc
Astronomy and Astrophysics
Astronomy
Scientific paper
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 the individual radio source evolution, with typical ages of a few hundred years. The selection tools used to identify a source as an HFP, the convex shape of the radio spectrum and the high turnover frequency, can introduce a contamination by beamed objects, like blazars, which can occasionally show a convex spectrum during particular phases of their variability.
We present the results of new multi-epoch, multi-frequency VLA observations of the 55 sources from the Bright HFP sample. The comparison between such results and the pc-scale morphology information already acquired enables us to determine the nature of HFP radio sources.
Dallacasa Daniele
Orienti Monica
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