A1 Refereed original research article in a scientific journal
A COMPLETE SAMPLE OF NORTHERN-HEMISPHERE ACTIVE GALACTIC NUCLEI - DIFFERENCES IN FLUX AND SPECTRA AT HIGH RADIO FREQUENCIES
Authors: WIREN S, VALTAOJA E, TERASRANTA H, KOTILAINEN J
Publisher: AMER INST PHYSICS
Publication year: 1992
Journal:: Bulletin of the American Astronomical Society
Journal name in source: ASTRONOMICAL JOURNAL
Journal acronym: ASTRON J
Volume: 104
Issue: 3
First page : 1009
Last page: 1017
Number of pages: 9
ISSN: 0004-6256
DOI: https://doi.org/10.1086/116294
Abstract
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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