Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006an....327.1055p&link_type=abstract
Astronomische Nachrichten, Vol.327, Issue 10, p.1055
Astronomy and Astrophysics
Astronomy
3
Galaxies: Individual: Ngc 4051, Iras13224-3809, Galaxies: Active, Galaxies: Seyfert, X-Rays: Galaxies
Scientific paper
A spectral variability study of the two Narrow Line Seyfert 1 galaxies NGC 4051 and IRAS13224-3809 is presented. Both sources show a high degree of flux and spectral variability. The nuclear emission, lightly absorbed by warm material, has been decomposed into a direct power law emission and an ionized disc reflection plus constant emission from distant material. The ionized disc reflection component does not follow the variations of the primary component. Its flux is linearly correlated with the one of the power law component only at low fluxes, while it is almost constant at medium high-flux. This behavior is expected when the light bending effect is important. If so, most of the primary emission comes from only a few gravitational radii from the black hole.
Cappi Massimo
Fabian Andrea C.
Miniutti Giovanni
Palumbo Giorgio G. C.
Ponti Gabriele
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