Active nuclei - Observations, classifications, and observational constraints
Abstract
The observational data and statistically determined physical properties of active galactic nuclei are summarized. A spectroscopic continuity has been observed which encompasses a scale of 100,000 for the known active nuclei. Primary radiation of the sources is in the UV and the hard X ray regions, and further observation in the IR at 100 microns, the UV near 100 MeV, and gamma wavelengths near 1 MeV are indicated. A correlation has been indicated between the X ray emissions and dense gas close to the sources of nontherma. radiation. Global dimensions are defined for the broad line region, together with the flux and mass, and the presence of a very hot region is examined. Calculations of the energy balance, variations, the size, and the mass of the central source are described. Finally, correlations between the separately observed properties are explored.
- Publication:
-
Active Nuclei of Galaxies
- Pub Date:
- 1982
- Bibcode:
- 1982ang..procQ....B
- Keywords:
-
- Astronomical Spectroscopy;
- Galactic Nuclei;
- Radio Galaxies;
- Active Galactic Nuclei;
- Bl Lacertae Objects;
- Opacity;
- Quasars;
- Radial Velocity;
- Seyfert Galaxies;
- Spatial Resolution;
- Spectral Energy Distribution;
- Thomson Scattering;
- Ultraviolet Spectra;
- Astrophysics