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A link between X-ray variability and ultraviolet emission in Seyfert 1 type AGN

R. Walter, T. J.-L. Courvoisier

Abstract

We analyse the behaviour of X-ray spectral variations in Seyfert 1 type active galactic nuclei observed many times in the 2-10 keV energy band. The selected sources are compatible with a separation into two groups distinguished by different kinds of X-ray variability and by different ratios of ultraviolet to X-ray fluxes. In the first group of objects the X-ray spectral variations are related to the ratio of the medium X-ray flux to the ultraviolet or soft X-ray flux while in the second group the spectra steepen when the sources brigthen.

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Key concepts: Physics, Astrophysics, Ultraviolet, Flux (metallurgy), X-ray, Spectral line, Active galactic nucleus, Astronomy