Issue |
A&A
Volume 365, Number 1, January 2001
First Results from XMM-Newton
|
|
---|---|---|
Page(s) | L122 - L127 | |
DOI | https://doi.org/10.1051/0004-6361:20000215 | |
Published online | 15 January 2001 |
XMM-Newton detection of a Comptonized accretion disc in the quasar PKS 0558-504
1
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, pto@star.le.ac.uk
Received:
27
September
2000
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.