The soft X-ray spectrum of NGC 4151
Abstract
EXOSAT observations of the Seyfert galaxy NGC 4151 over the period July 1983 to April 1984 have revealed a decreasing flux in the 2 10 keV band. In accord with previous measurements a power law spectrum attenuated with a simple column of cold gas does not provide a satisfactory spectral fit below ∼3 keV, where a lower relative opacity is required. Inclusion of additional low energy data from the EXOSAT telescopes allows the modelling of the absorbing column to be improved and reveals a second, separate, soft X-ray spectral component.
- Publication:
-
Space Science Reviews
- Pub Date:
- April 1985
- DOI:
- 10.1007/BF00179870
- Bibcode:
- 1985SSRv...40..585P
- Keywords:
-
- Astronomical Spectroscopy;
- Galactic Radiation;
- Seyfert Galaxies;
- X Ray Astronomy;
- Energy Spectra;
- Exosat Satellite;
- Flux Quantization;
- Photons;
- Spaceborne Astronomy;
- Astrophysics