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Unveiling the X-ray broad band continuum and iron line complex on Mkn 841

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 different 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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Submitted on : Monday, November 5, 2007 - 5:24:21 PM
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Pierre-Olivier Petrucci, G. Ponti, G. Matt, A. Longinotti, M. Mouchet, et al.. Unveiling the X-ray broad band continuum and iron line complex on Mkn 841. VI Microquasar Workshop: Microquasars and Beyond, Sep 2006, Come, Italy. pp.89. ⟨in2p3-00185306⟩



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