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The origin of the strong soft excess and puzzling iron line complex in Mkn 841

P. O. Petrucci·G. Ponti·G. Matt·L. Maraschi·J. Malzac·M. Mouchet·C. Boisson·A. Longinotti·K. Nandra·P. Ferrando·G. Henri
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Abstract

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.

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P. O. Petrucci, G. Ponti, G. Matt, L. Maraschi, J. Malzac, M. Mouchet, C. Boisson, A. Longinotti, K. Nandra, P. Ferrando, G. Henri. 2006-11-21. The origin of the strong soft excess and puzzling iron line complex in Mkn 841. https://doi.org/10.1002/asna.200610689

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