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A COMPLETE SAMPLE OF NORTHERN-HEMISPHERE ACTIVE GALACTIC NUCLEI - DIFFERENCES IN FLUX AND SPECTRA AT HIGH RADIO FREQUENCIES
Tekijät: WIREN S, VALTAOJA E, TERASRANTA H, KOTILAINEN J
Kustantaja: AMER INST PHYSICS
Julkaisuvuosi: 1992
Lehti:: Bulletin of the American Astronomical Society
Tietokannassa oleva lehden nimi: ASTRONOMICAL JOURNAL
Lehden akronyymi: ASTRON J
Vuosikerta: 104
Numero: 3
Aloitussivu: 1009
Lopetussivu: 1017
Sivujen määrä: 9
ISSN: 0004-6256
DOI: https://doi.org/10.1086/116294
Tiivistelmä
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.
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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