A Complete Sample of Northern Hemisphere Active Galactic Nuclei: Differences in Flux and Spectra at High Radio Frequencies
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.
- Publication:
-
The Astronomical Journal
- Pub Date:
- September 1992
- DOI:
- 10.1086/116294
- Bibcode:
- 1992AJ....104.1009W
- Keywords:
-
- Active Galactic Nuclei;
- Blazars;
- Extragalactic Radio Sources;
- Quasars;
- Radio Frequencies;
- Radio Galaxies;
- Active Galaxies;
- Bl Lacertae Objects;
- Northern Hemisphere;
- Radio Telescopes;
- Astrophysics;
- GALAXIES: ACTIVE;
- RADIO CONTINUUM: GENERAL;
- RADIO CONTINUUM: GALAXIES