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Ё METSAHOVI AGN PROJECTS CONTRIBUTING TO THE PLANCK FOREGROUND SCIENCE
M. Tornikoski1 , A. LЁ teenmЁ 1 , T. Hovatta1 , E. Niepp ola1 , I. Torniainen1 , E. Valtao ja ah aki
1 2

Helsinki University of Technology, MetsЁ vi Radio Observatory aho MetsЁ vintie 114, 02540­KylmЁ a, Finland aho alЁ 2 Tuorla Observatory, University of Turku, Finland merja.tornikoski@tkk.fi

During recent years we have had a sp ecial fo cus in our MetsЁ vi observing pro jects. We aho have put an emphasis on the understanding of AGNs that could contribute to the extragalactic foreground that will b e detectable by the Planck satellite. First of all, we have observed completely new source samples. Many AGN samples have b een excluded from high-frequency radio observations earlier simply b ecause they were assumed to b e to o faint or "uninteresting". One of our largest new source samples was the complete BL Lacertae Ob ject (BLO) sample. In addition to the few-ep o ch observations of large source samples we have b een interested in the long-term variability b ehaviour of a densely monitored set of sources. We have analysed these data in order to improve our understanding of the variability b ehaviour of these sources: how often do flares typically o ccur 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 ep o ch? We are also working our way towards predicting, or at least making "educated guesses" ab out, the activity b ehaviour of radio-bright AGNs. In this presentation we will discuss our source samples and show some recent results.