期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 388, 期 2, 页码 761-769出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1365-2966.2008.13438.x
关键词
galaxies : active; galaxies : nuclei; quasars : general; quasars : individual : PG 1543+489
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 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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