XMM-Newton Detection of a Comptonized Accretion Disc in the Quasar PKS0558-504

Abstract

We present XMM-Newton observations of the bright quasar PKS0558-504. 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 PKS0558-504 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.

Accepted for publication in A&A special issue on first results from XMM

References in corpus (4)

• The European Photon Imaging Camera on XMM-Newton: The MOS Cameras
• The XMM-Newton Optical/UV Monitor Telescope
• The first broad-band X-ray images and spectra of the 30 Doradus region in the LMC
• XMM-Newton monitoring of X-ray variability in the quasar PKS 0558-504

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