A COMPLETE SAMPLE OF NORTHERN-HEMISPHERE ACTIVE GALACTIC NUCLEI - DIFFERENCES IN FLUX AND SPECTRA AT HIGH RADIO FREQUENCIES



: WIREN S, VALTAOJA E, TERASRANTA H, KOTILAINEN J

Publisher: AMER INST PHYSICS

: 1992

Bulletin of the American Astronomical Society

ASTRONOMICAL JOURNAL

: ASTRON J

: 104

: 3

: 1009

: 1017

: 9

: 0004-6256

DOI: https://doi.org/10.1086/116294


We present two-epoch 22 and 37 GHz flux measurements of a complete 1 Jy sample of flat-spectrum extragalactic radio sources. The spectral and variability properties of quasars and blazars in our sample are similar. Radio galaxies, which have steeper cm-to-mm spectra, are the only sources which can be identified solely on the basis of their radio continuum properties. Surprisingly, among the flat-spectrum sources the BL Lacs and low polarization quasars with the steepest spectra seem to be the most variable ones. The implications of these results for orientation-dependent unified models for active galaxies are discussed.



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