出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：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.
