Volume 365, Number 1, January 2001
First Results from XMM-Newton
|Page(s)||L122 - L127|
|Published online||15 January 2001|
XMM-Newton detection of a Comptonized accretion disc in the quasar PKS 0558-504
X-Ray Astronomy Group, Department of Physics and Astronomy, University of Leicester, LE1 7RH, UK
2 MSSL, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK
3 Max-Plank-Institut für extraterrestrische Physik, Postfach 1312, 85741, Garching, Germany
4 Istituto TESRE, CNR, Via Gobetti 101, 40129 Bologna, Italy
Corresponding author: P. T. O'Brien, firstname.lastname@example.org
Accepted: 19 October 2000
We present XMM-Newton observations of the bright quasar PKS 0558-504. The 0.2-10 keV spectrum is dominated by a large, variable soft X-ray excess. The fastest flux variations imply accretion onto a Kerr black hole. The XMM-Newton data suggest the presence of a "big blue bump"in PKS 0558-504 extending from the optical band to ~3 keV. The soft X-ray spectrum shows no evidence for significant absorption or emission-line features. The most likely explanation for the hot big blue bump is Comptonization by the multi-temperature corona of a thermal accretion disc running at a high accretion rate.
Key words: galaxies: active / X-rays: galaxies / accretion discs / quasars: individual: PKS 0558-504
© ESO, 2001
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