Journal Article

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

Cristian Vignali, Enrico Piconcelli, Stefano Bianchi and Giovanni Miniutti

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 388, issue 2, pages 761-769
Published in print August 2008 | ISSN: 0035-8711
Published online July 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13438.x
On the peculiar properties of the narrow-line quasar PG 1543+489

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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 3 yr. The X-ray spectrum is characterized by a broad, relativistic iron Kα 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.

Keywords: galaxies: active; galaxies: nuclei; quasars: general; quasars: individual: PG 1543+489

Journal Article.  7024 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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