Observations of the ultraviolet spectrum of the variable Seyfert galaxy NGC4151
Abstract
High-resolution UV spectra of NGC 4151 from the IUE satellite are presented and discussed. The Lyman-alpha emission line is narrow and asymmetrical - there are two absorption systems. One is narrow and probably represents the outer parts of NGC 4151. The other is broad, primarily from material nearer to the nucleus. C IV 1550 A emission is broad, with absorption between velocities of -100 and -1100 km/sec. The absorbing clouds cover at least 80 percent of the emission region. Due to the doublet nature of the line, alternative explanations are possible for the details of the C IV absorption profile. Two such alternatives are discussed.
- Publication:
-
The First Year of IUE
- Pub Date:
- 1979
- Bibcode:
- 1979IUE1.symp..126B
- Keywords:
-
- Galactic Radiation;
- Iue;
- Seyfert Galaxies;
- Ultraviolet Spectra;
- Absorption Spectra;
- Astronomical Spectroscopy;
- Emission Spectra;
- Lyman Spectra;
- Astrophysics