The γ-ray emission from the Seyfert galaxy NGC 4151
Abstract
Light curves at X-ray, ultraviolet, optical and infrared wavelengths of NGC 4151 over the period 1977 1980 are presented together with a summary of the large amount of observational data relating to this Seyfert galaxy. Intensity variations in different wavebands are discussed and compared with recent low energy γ-ray observations of this object. The positive measurement of gamma-radiation in May 1977 is shown to have been characterised by a high optical state and a possible infrared maximum. The data presented are compared with the predictions of some emission mechanisms, which have been proposed to account for the gamma-radiation. In particular, a synchrotron self-Compton model, which relates the infrared/optical emission to the X-ray/low energy γ-ray emission is discussed.
- Publication:
-
Astrophysics and Space Science
- Pub Date:
- October 1981
- DOI:
- 10.1007/BF00649442
- Bibcode:
- 1981Ap&SS..79..469B
- Keywords:
-
- Galactic Radiation;
- Gamma Ray Astronomy;
- Light Curve;
- Seyfert Galaxies;
- Gamma Ray Spectra;
- Infrared Astronomy;
- Spiral Galaxies;
- Ultraviolet Astronomy;
- X Ray Astronomy;
- Astrophysics