Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-11-21
Astron.Nachr.327:1043-1046,2006
Astronomy and Astrophysics
Astrophysics
4 pages, 6 Figures. Accepted for publication in Astronomische Nachrichten, proceedings of the ESAC Workshop "Variable and Broa
Scientific paper
10.1002/asna.200610689
Mkn 841 has been observed during 3 different periods (January 2001, January 2005 and July 2005) by XMM-Newton for a total cumulated exposure time of ~108 ks. We present in this paper a broad band spectral analysis of the complete EPIC-pn data sets. These observations confirm the presence of the strong soft excess and complex iron line profile known to be present in this source since a long time. They also reveal their extreme and puzzling spectral and temporal behaviors. Indeed, the 0.5-2 keV soft X-ray flux decreases by a factor 3 between 2001 and 2005 and the line shape appears to be a mixed of broad and narrow components, both variable but on differen timescales. The broad-band 0.5-10 keV spectra are well described by a model including a primary power law continuum, a blurred photoionized reflection and a narrow iron line, the blurred reflection fitting self-consistently the soft excess and the broad line component. The origin and nature of the narrow component is unclear.
Boisson Catherine
Ferrando Ph.
Henri Gilles
Longinotti Antonio
Malzac Julien
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