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X-Ray Luminosity and Spectral Variability of Hard X-Ray--selected Active Galactic Nuclei

Tagliaferri, G.; Giommi, P.; Grandi, P. +2 more

One hundred sixty-one observations archived in the EXOSAT data base are analyzed in order to study time and spectral variability of all 30 sion-line active galactic nuclei (AGNs) in the Piccinotti sample. For each source long-term (from days to months) and short-term (from minutes to hours) luminosity variations were sought using the soft (LE: 0.0…