Constraints on pairs and reflection in active galaxies

Astronomy and Astrophysics – Astronomy

Scientific paper

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Accretion Disks, Active Galaxies, Compton Effect, Pair Production, Reflection, Seyfert Galaxies, Constraints, Ginga Satellite, X Ray Astronomy

Scientific paper

Models including photon-photon pair production and reprocessing by cold material by Compton scattering and absorption have recently received wide attention, especially since Ginga spectra of many Seyfert galaxies have shown a hard X-ray tail, expected from the latter process. We discuss hard X-ray observations of three AGN (NGC 4151, 3C 273 and Cen A) by the HEXE instrument in the light of these models.

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