Study of Variability of Quasars at Microwaves

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

Regular quasar measurements at the Metsähovi Radio Research Station have been performed since 1980 using a 13.7 metre radio telescope. More than 3000 measurements have been done using receivers operating on 22 GHz, 37 GHz, and 87 GHz. About 50 sources have been selected for this study. Most of the sources show long term variability. For some sources like OJ 287, OH 471, and 3C 120 weekly and monthly variations have occurred. For two sources OJ 287 and BL Lac also minute scale variability have been observed.

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