Ten Years Monitoring of Extragalactic Radio Sources at Metsahovi

Details Ten Years Monitoring of Extragalactic Radio Sources at Metsahovi Ten Years Monitoring of Extragalactic Radio Sources at Metsahovi

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.0307l&link_type=abstract

American Astronomical Society, 180th AAS Meeting, #03.07; Bulletin of the American Astronomical Society, Vol. 24, p.731

Physics

Scientific paper

High radio frequency observations of active galaxies are necessary to study the innermost radio emitting regions in these sources. Both continuum monitoring and VLBI imaging at the standard low GHz frequencies relate mainly to the older, more extended and less variable components, and do not give direct access to the physics of the core. So the monitoring of time variability of AGN at high frequencies is the only way to get information about ``the central engine'' of AGN. Measurements of extragalactic sources have been done on a regular basis with the Metsahovi radio telescope since 1980. Most of the observations are done at frequencies 22 and 37 GHz. Since 1984 also 77 GHz and later 87 GHz observations have been done. The higher frequency data, although not so regular and numerous will anyway be important in predicting the behaviour of the sources at lower frequencies. Latest observations of the most interesting sources at 22 and 37 GHz are presented. We analyse the 22 and 37 GHz variability characteristics of a representative sample of bright, flat-spectrum extragalactic radio sources. The sample consists of 8 BL Lacs, 7 high polarization quasars and 8 low polarization quasars observed at Metsahovi. We find that both the spectral and variability characteristics of BL Lacs and quasars are very similar. This indicates that they all have the same basic structure and the same basic mechanism for radio variability.

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