Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-10-19
Astronomy and Astrophysics
Astrophysics
Accepted for publication in A&A special issue on first results from XMM
Scientific paper
10.1051/0004-6361:20000215
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.
Brinkmann Wolfgang
Dadina Mauro
Gliozzi Mario
O'Brien Thomas P.
Page Mat
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