XMM-Newton detection of a Comptonized accretion disc in the quasar PKS 0558-504

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-Ne wton data suggest the presence of a "big blue bump" in PKS 0558-504 extendi ng from the optical band to similar to3 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.