The appearance of broad emission lines in the spectrum of the BL Lac object PKS 0521-36
Abstract
Observations are reported which show that intense broad permitted lines have appeared in the spectrum of PKS 0521-36, a radio galaxy which in the past could be classified as a BL Lac object on the basis of its variable and polarized optical continuum and its weak narrow emission line spectrum. The full width at zero intensity of H-alpha emission lines is about 120 A.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- November 1981
- Bibcode:
- 1981A&A...103L...1U
- Keywords:
-
- Bl Lacertae Objects;
- Elliptical Galaxies;
- Emission Spectra;
- H Alpha Line;
- Optical Emission Spectroscopy;
- Radio Galaxies;
- H Beta Line;
- Polarized Light;
- Spectrum Analysis;
- Astronomy