Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-08-11
Nucl.Phys.Proc.Suppl.132:213-216,2004
Astronomy and Astrophysics
Astrophysics
4 pages, 5 figures. Proc. of the meeting: "The Restless High-Energy Universe" (Amsterdam, The Netherlands), E.P.J. van den Heu
Scientific paper
10.1016/j.nuclphysbps.2004.04.03
Mkn 841 has been observed simultaneously by XMM and BeppoSAX in January 2001. Due to operational contingency, the 30ks XMM observation was split into two parts, separated by about 15 hours. We first report the presence of a narrow iron line which appears to be rapidly variable between the two pointings, requiring a non-standard interpretation. We then focus on the analysis of the broad band (0.3-200 keV) continuum using the XMM/EPIC, RGS and SAX/PDS data. The Mkn 841 spectrum is well fitted by a comptonization model in a geometry more photon-fed than a simple slab geometry above a passive disk. It presents a relatively large reflection (R>2) which does not agree with an apparently weak iron line. It also show the presence of a strong soft excess wellfitted by a comptonized spectrum in a cool plasma, suggesting the presence of a multi-temperature corona.
Cabanac Clement
Collin Suzy
Dumont Anne-Marie
Ferrando Ph.
Haardt Francesco
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