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Monthly Notices of the Royal Astronomical Society 388 (2008) 761-769
On the peculiar properties of the narrow-line quasar PG 1543+489
C. Vignali1, E. Piconcelli2, S. Bianchi2, G. Miniutti1, 3
(2008)

We present the analysis of four XMM-Newton observations of the narrow-line quasar PG 1543+489 at z=0.400 carried out over a rest-frame time-scale of about three years. The X-ray spectrum is characterized by a broad, relativistic iron K_alpha emission line and a steep photon index, which can be both explained by a ionized reflection model, where the source of X-ray photons is presumably very close to the black hole. If this were the case, strong light-bending effects are expected, and actually they provide the most plausible explanation for the large equivalent width (EW=3.1+/-0.8 keV in the source rest frame) of the iron line. Although the light-bending model provides a good description of the X-ray data of PG 1543+489, it is not possible to rule out an absorption model, where obscuring matter partially covers the X-ray source. However, the apparent lack of variations in the properties of the absorber over the time-scale probed by our observations may indicate that this model is less likely.
1 :  Dipartimemto di Astronomia, Universita degli Studi di Bologna
2 :  Dipartimento di Fisica, Universita degli Studi Roma Tre, via della Vasca Navale 84, 00146 Roma, Italy
3 :  APC - UMR 7164 - AstroParticule et Cosmologie
APC - AHE
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/0805.1227