Äîêóìåíò âçÿò èç êýøà ïîèñêîâîé ìàøèíû. Àäðåñ îðèãèíàëüíîãî äîêóìåíòà : http://www.sao.ru/cats/~satr/RFSymp/abs/33_Tornikoski.ps Äàòà èçìåíåíèÿ: Mon Oct 9 11:14:24 2006 Äàòà èíäåêñèðîâàíèÿ: Tue Oct 2 10:18:43 2012 Êîäèðîâêà:

METS ˜
AHOVI AGN PROJECTS CONTRIBUTING TO THE
PLANCK FOREGROUND SCIENCE
M. Tornikoski 1 , A. L˜ahteenm˜aki 1 , T. Hovatta 1 , E. Nieppola 1 , I. Torniainen 1 , E. Valtaoja 2
1 Helsinki University of Technology, Mets˜ahovi Radio Observatory
Mets˜ahovintie 114, 02540--Kylm˜al˜a, Finland
2 Tuorla Observatory, University of Turku, Finland
merja.tornikoski@tkk.fi
During recent years we have had a special focus in our Mets˜ahovi observing projects. We
have put an emphasis on the understanding of AGNs that could contribute to the extra­
galactic foreground that will be detectable by the Planck satellite.
First of all, we have observed completely new source samples. Many AGN samples have
been excluded from high­frequency radio observations earlier simply because they were
assumed to be too faint or ``uninteresting''. One of our largest new source samples was the
complete BL Lacertae Object (BLO) sample.
In addition to the few­epoch observations of large source samples we have been interested
in the long­term variability behaviour of a densely monitored set of sources. We have
analysed these data in order to improve our understanding of the variability behaviour of
these sources: how often do flares typically occur in a certain source, and how likely is e.g.
the Planck satellite to detect a source in a flaring state at a random observing epoch?
We are also working our way towards predicting, or at least making ``educated guesses''
about, the activity behaviour of radio­bright AGNs.
In this presentation we will discuss our source samples and show some recent results.