Simultaneous EXOSAT-IUE observations of NGC 4151
Abstract
NGC 4151 was observed four times in Nov. 83. The results indicate that: a) there exists a correlation between the X-ray and UV fluxes on the long term; b) the soft X-ray excess between 0.1 and 1 keV is probably steeper than expected from the leaky absorber model by Holt et al (1980); c)the spectral fit to the ME data, after correction for a soft component, yields α=1,73±0.27, NH=(15.2±2.2)×1022 cm-2, E.W.(Fe line)=0.208±0.084 keV, and does not require a strong overabundance of Fe in the absorber. The relationship between NH and the strength of the broad emission lines is commented.
- Publication:
-
Space Science Reviews
- Pub Date:
- April 1985
- DOI:
- 10.1007/BF00179871
- Bibcode:
- 1985SSRv...40..593P
- Keywords:
-
- Exosat Satellite;
- Iue;
- Seyfert Galaxies;
- Emission Spectra;
- Iron;
- Line Spectra;
- Nitrogen;
- Ultraviolet Spectra;
- X Rays;
- Astrophysics