Mapping the inner regions of Seyfert galaxies

Details Mapping the inner regions of Seyfert galaxies Mapping the inner regions of Seyfert galaxies

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cnag.confe...1p&link_type=abstract

"The Composite Nature of Active Galactic Nuclei - Proceedings of 6th Italian Conference on AGN, Volterra 25-28 May 2004. Ed. L.

Astronomy and Astrophysics

Astronomy

Scientific paper

Preliminary results from a timing analysis of XMM-Newton observations of the three Seyfert galaxies MCG-6-30-15, Mkn 766 and NGC 4051 are presented. Model-independent tools have been used with the intent of separating the different components that produce the observed flux and spectral variations. We find that the fractional variability "gross shape" is similar for the three sources. It is consistent with a contribution from a (fast) variable power law component in the hard band, and a slower thermal component at softer energies. The most relevant result of this work is the indication of an enhancement of the fractional variability spectrum in MCG-6-30-15 and Mkn 766 in the 4.5-5.8 keV energy band compared with the underlying continuum. This is a model-independent confirmation of the presence of redshifted relativistic matter accreting into the black hole. Moreover, in the fractional variability spectrum of Mkn 766 and NGC 4051 two highly significant enhancements of variability are clearly detected between 0.5-1 keV. These structures could provide the key to disentangle between the dusty warm absorber and the relativistic diskline emission models.

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