Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..599..710l&link_type=abstract
X-RAY ASTRONOMY: Stellar Endpoints,AGN, and the Diffuse X-ray Background. Edited by Nicholas E. White, Giuseppe Malaguti, and G
Astronomy and Astrophysics
Astronomy
Active And Peculiar Galaxies And Related Systems, X-Ray Sources, X-Ray Bursts
Scientific paper
We have monitored the Seyfert galaxies NGC 4051 and NGC 5506 with RXTE for the last 3 years. During this time, we have witnessed large variations in the X-ray flux of both sources, coupled to spectral variability. In both objects the 6.4 keV iron fluorescence line and the reflection hump are relatively stronger during fainter states of the X-ray source. These variations can be simply explained if there are not one, but two reflection components contributing to the X-ray spectrum of these sources: a reflection component which scales linearly with the primary continuum flux (as expected from the accretion disk), and a constant component due to reflection off distant cold matter. .
Lamer Georg
McHardy Ian M.
Uttley Phil
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