High frequency peakers

Details High frequency peakers High frequency peakers

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009an....330..167o&link_type=abstract

Astronomische Nachrichten, Vol.330, Issue 2, p.167

Astronomy and Astrophysics

Astronomy

5

Galaxies: Active, Radio Continuum: General, Radiation Mechanisms: Non-Thermal

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 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.

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