Physics
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1053...59r&link_type=abstract
OBSERVATIONAL EVIDENCE FOR BLACK HOLES IN THE UNIVERSE: Proceedings of the 2nd Kolkata Conference on Observational Evidence for
Physics
X-Ray, Quasars, Active Or Peculiar Galaxies, Objects, And Systems, Galactic Nuclei, Circumnuclear Matter, And Bulges
Scientific paper
I present the results of X-ray variability studies of three bright Seyfert 2 Galaxies observed with Beppo-SAX, XMM-Newton and Chandra. These sources exibit significant variations in their hardness-ratio light curves. The main new point of our approach is a separate spectral analysis of each interval with constant hardness ratio. This allows a more precise spectral fits, and the measurement of the variability of different physical components, mainly the absorbing column density and the continuum slope. In the most extreme case in our sample, the Seyfert galaxy NGC 1365, we detected column density variations in time scales of hours, which imply a distance of the X-ray absorber of the order of that of the Broad Line Region.
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