Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-12-10
Astronomy and Astrophysics
Astrophysics
8 pages, 9 figures. Proceeding of the Fifth Italian National Meeting on AGNs, 11-14 June 2002 Como Italy. All the proceedings
Scientific paper
We discuss recent results on the Seyfert spectral variability. Their observed high energy variability is generally consistent with X-ray spectral slop fluctuations produced by change of the soft photon luminosity in the sense that spectra soften when the UV flux increases. These behaviors strongly favor a thermal origin for the X-ray emission in these objects. We present the case of NGC 7469, showing the results of the reanalysis of the simultaneous IUE/XTE observations of this object using a realistic thermal Comptonization model to fit the continuum instead of the simple power law approximation adopted in the past.
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