Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984xue..conf..108m&link_type=abstract
In Max-Planck Inst. für Physik und Astrophysik X-Ray and UV Emission from Active Galactic Nuclei p 108-110 (SEE N85-17790 08-88)
Astronomy and Astrophysics
Astrophysics
Emission Spectra, Seyfert Galaxies, X Ray Spectra, Flux Density, Iron, Line Spectra, Periodic Variations
Scientific paper
The TENMA satellite observed NGC4151 with gas scintillation proportional counters in January and March 1984. During these two intervals the X-ray intensity is as weak as a few microJy, showing variability on a time scale of a few days. Spectra from NGC4151 reveal a strong iron emission line with an energy of 6.4 keV; i.e., the equivalent width for both periods is 300 to 350 eV. This suggests that the line intensity is too intense to be emitted through a simple fluorescence mechanism due to the observed continuum X-rays above the energy of the K-edge.
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