Anisotropic Illumination in AGNs. The reflected component. Comparison to hard X-ray spectra from Seyfert Galaxies

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dc.creatorMalzac, J.
dc.creatorJourdain, E.
dc.creatorPetrucci, P. O.
dc.creatorHenri, G.
dc.date1998-06-15
dc.date.accessioned2026-07-07T02:27:12Z
dc.date.available2026-07-07T02:27:12Z
dc.descriptionWe calculate the reflection component predicted by the anisotropic illumination model of Henri & Petrucci 1997. This component appears to be more important than for isotropic models. The overall X/gamma spectrum is found to be strongly angle-dependent. When the accretion disc is seen with a nearly edge-on orientation the reflection hump is weak, while a face-on viewing angle leads to a proeminent reflection hump with an equivalent reflection coefficient R close to 50. Such reflection dominated Seyfert 1s galaxies are not observed. By fitting observed X/gamma spectra, we derive inclination angles of 70 degrees for MCG 8-11 -11 and 80 degrees for IC 4329a and NGC 4151. Although the model succeed in reproducing individual observed spectra, it requires all the Seyfert 1s observed in the X-ray band to be seen with large inclination angles. Such a situation is highly improbable. On the other hand, we show that the ionisation of a fair part of the reflecting disk could represent an interesting improvement of the model, consistent with the data and relaxing the constraints on the high energy cut-off in Seyfert galaxies.
dc.description8 pages, 4 figures, to be published in A&A
dc.identifierhttps://arxiv.org/abs/astro-ph/9806199
dc.identifierhttp://arxiv.org/abs/astro-ph/9806199
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/12588
dc.subjectAstrophysics
dc.titleAnisotropic Illumination in AGNs. The reflected component. Comparison to hard X-ray spectra from Seyfert Galaxies
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