Optical spectra of radio galaxies.
Abstract
Based on Lick image-tube-image-dissector scans of 35 radio galaxies known to have emission lines, a high degree of association is found between the spectroscopic classification 'broad-line' and the morphological classification 'N.' Relative line intensities are presented for nine broad-line radio galaxies (BLRG). These data, combined with previously published results, illustrate three spectroscopic differences between BLRG and Seyfert 1 galaxies: BLRG have much weaker Fe II emission, steeper H-alpha/H-beta ratios, and larger 5007-A forbidden O III/H-beta ratios than Seyfert 1 galaxies.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- March 1978
- DOI:
- Bibcode:
- 1978ApJ...220..783G
- Keywords:
-
- Emission Spectra;
- Galactic Structure;
- Line Spectra;
- Radio Galaxies;
- Spectrophotometry;
- Galactic Radiation;
- H Alpha Line;
- H Beta Line;
- Luminous Intensity;
- Seyfert Galaxies;
- Astronomy;
- Optical Spectra:Radio Galaxies;
- Seyfert Galaxies:Spectra