The nature of X-ray spectral variability in Seyfert Galaxies

Details The nature of X-ray spectral variability in Seyfert Galaxies The nature of X-ray spectral variability in Seyfert Galaxies

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004nuphs.132..236t&link_type=abstract

Nuclear Physics B Proceedings Supplements, Volume 132, p. 236-239.

Physics

Nuclear Physics

Scientific paper

In many Seyfert galaxies the 2-20 keV X-ray spectrum typically softens with increasing X-ray flux. This effect has been explained by two different models; either pivoting of a single spectral component or relative changes in the normalisations of two components (a hard and a soft) which each have constant shape. We present a model-independent technique to analyse spectral variability, the `flux-flux' plot, which shows conclusively that the two-component model is correct for some Seyfert galaxies (including the well studied MCG-6-30-15 ) but in other Seyferts spectral pivoting applies (e.g. NGC 4051). The nature of each of the spectral components in MCG-6-30-15 are briefly examined.

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