158 articles – 1990 Notices  [english version]
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THE MULTICOLORED LANDSCAPE OF COMPACT OBJECTS AND THEIR EXPLOSIVE ORIGINS, Cefalu, Sicile : Italie (2006)
The origin of the strong soft excess and puzzling iron line complex in Mkn 841
P.O. Petrucci1, G. Ponti, G. Matt2, L. Maraschi, J. Malzac3, M. Mouchet4, 5, C. Boisson4, K. Nandra, A. Longinotti, P. Ferrando5, 6, G. Henri1
(2007)

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.
1 :  LAOG - Laboratoire d'Astrophysique de Grenoble
2 :  Dipartimento di Fisica
3 :  CESR - Centre d'étude spatiale des rayonnements
4 :  LUTH - Laboratoire Univers et Théories
5 :  APC - UMR 7164 - AstroParticule et Cosmologie
6 :  DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
APC - Cosmologie et gravitation
APC - AHE
Planète et Univers/Astrophysique

Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique
active galaxies – X-ray sources (astronomical)