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| Paper: |
New insights into the UV-Xray variability behaviour of NGC 7469 |
| Volume: |
290, Active Galactic Nuclei: from Central Engine to Host Galaxy |
| Page: |
121 |
| Authors: |
Petrucci, P.-O.; Nandra, P.; Maraschi, L. |
| Abstract: |
[ADS note: this abstract is for the paper published in 2002.] We will discuss recent results on the spectral variability of Seyfert galaxies as derived from analysis of BeppoSAX, XTE and XMM data. We show that the observed variability in Seyfert galaxies is generally consistent with fluctuations of the X-ray spectral slope with a nearly constant comptonised luminosity, i.e. the spectrum is mainly pivoting. In this context, we also discuss the growing evidence in favor of a significant fraction of the reflection features being formed at large distance from the central engine. We then present the influences it has on the spectral variability and more precisely on the reported R-Γ correlation. We finally underline the importance of the model used to fit the primary continuum, especialy in anisotropic geometry, which may produce different trends and correlation between the physical parameters. We discuss these differences and their consequences for the physical models of the variability. |
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