EXOSAT observations of active galactic nuclei

Astronomy and Astrophysics – Astronomy

Scientific paper

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Active Galactic Nuclei, Exosat Satellite, Seyfert Galaxies, X Ray Astronomy, Absorption Spectra, Line Spectra

Scientific paper

Observations by EXOSAT of the Type 1 Seyfert galaxies NGC3783 and NGC5548 are reported. The X-ray spectrum of NGC3783 is not heavily cutoff at low energies, unlike the results of previous observations. This suggests that the conditions of the broad-line region in NGC3783 are different from those in which the earlier data were obtained. A low-energy excess in the spectrum of NGC5548 suggests that this is due to the presence of a break in the continuum distribution between the soft X-ray and UV ranges.

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