On the peculiar properties of the narrow-line quasar PG 1543+489

Details On the peculiar properties of the narrow-line quasar PG 1543+489 On the peculiar properties of the narrow-line quasar PG 1543+489

2008-05-08

arxiv.org/abs/0805.1227v1

Astronomy and Astrophysics

Astrophysics

9 pages, 5 figures, 3 tables, accepted for publication by MNRAS

Scientific paper

10.1111/j.1365-2966.2008.13438.x

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.

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