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Title: XMM-Newton detection of a Comptonized accretion disc in the quasar PKS 0558-504
Authors: O'Brien, P. T.
Reeves, J. N.
Turner, M. J. L.
Pounds, K. A.
Page, M.
Gliozzi, M.
Brinkmann, W.
Stephen, J. B.
Dadina, M.
First Published: Jan-2001
Publisher: EDP Sciences for European Southern Observatory (ESO)
Citation: Astronomy & Astrophysics, 2001, 365 (1)
Abstract: 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 $\sim$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.
DOI Link: 10.1051/0004-6361:20000215
ISSN: 0004-6361
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2001 ESO. Reproduced with permission from Astronomy & Astrophysics, © ESO.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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