Physics
Scientific paper
Oct 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006enig.confe...8t&link_type=abstract
Proceedings of the 8th ENIGMA meeting, held in Espoo, Finland, September 6-8, 2006, Eds: T.Hovatta, E.Nieppola and I.Torniainen,
Physics
Scientific paper
Our group has studied the long term radio variability of Active Galactic Nuclei (AGNs) for more than 25 years. Our current source list for monitoring consists of more than 80 objects. Additionally, we have made few-epoch multifrequency observations of large source samples. In this paper we show that even though they are very useful for determining the instantaneous continuum spectrum and for studying the general properties of large source samples, few-epoch observations or even short term monitoring does not suffice for determining the true variability behaviour of most radio-loud AGNs. We also show that, for studying the overall variability, long term monitoring is much more important than dense sampling.
Hovatta Talvikki
Kotiranta M.
Lahteenmaki Anne
Nieppola Elina
Torniainen I.
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