Hard X ray observations of AGN

Astronomy and Astrophysics – Astronomy

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Active Galactic Nuclei, Photon Density, Spaceborne Experiments, Stellar Radiation, X Ray Spectra, Background Radiation, Data Processing, Mir Space Station, Spectrum Analysis, Stellar Spectra, X Ray Sources

Scientific paper

Preliminary spectral results of hard X-ray observations (20 to 200 keV) of Active Galactic Nuclei (AGN) are presented. The observations were performed with the High Energy X-ray Experiment (HEXE) instrument of the Kvant module docked to the Soviet Space Station Mir. Three AGNs were observed: 3C 273, Cen A and NGC 4151. Power law fits to the data gave the following results: for 3C 273, the photon index was 1.49 + or - 0.11, the intensity was (6.93 + or - 0.29) x 0.00001 photons/sq cm sec keV. For Cen A, the best fit photon index was about 1.6 for two observations about a year apart. The intensity increased by a factor of at least 1.7 between the two observations. For NGC 4151, no change in spectral shape was found between November 1987 and January 1989. A common fit gave the photon index of 1.54 + or - 0.11. The intensity can only be determined for the November 87 data. The 50 keV intensity was found to be (5.72 + or - 0.29) x 0.00001 photons/sq cm sec keV.

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