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A rapidly variable narrow X-ray iron line in Mkn 841
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Astronomy Astrophysics manuscript no. February 1, 2008
(DOI: will be inserted by hand later)
A rapidly variable narrow X-ray iron line in Mkn 841
P.O. Petrucci1, G.Henri1, L.Maraschi2, P. Ferrando3, G.Matt4, M.Mouchet5, C. Perola4, S. Collin5,
A.M.Dumont5, F. Haardt7, and L.Koch-Miramond3
1 Laboratoire d’Astrophysique de Grenoble, BP 43, 38041 Grenoble Cedex 9, France
2 Osservatorio Astronomico di Brera, Via Brera 28, 02121 Milano, Italy
3 Service d’Astrophysique, DSM/DAPNIA/SAp, CE Saclay, 91191 Gif-sur-Yvette Cedex, France
4 Dipartimento di Fisica, Universita? degli Studi “Roma tre”, via della Vasca Navale 84, I-00046 Roma, Italy
5 LUTH, Observatoire de Paris, Section de Meudon, 92195 Meudon Cedex, France
6 Istituto di Astrofisica Spaziale, CNR, Via Fosso del Cavaliere 100, I-00133 Roma, Italy
7 Universita? dell’Insubria, Via Lucini 3, 22100 Como, Italy
Received/ Accepted
Abstract. We report on the detection of a rapidly variable narrow Fe Kα line in Mkn 841. The source has been
observed two times by XMM-Newton and simultaneously with BeppoSAX. The two observations, of about 10ks
long each, were separated by ～ 15 hours. The line flux reaches a maximum during the first observation and is
significantly reduced in the second one. The continuum shape and flux, instead, keep roughly constant between
the two pointings. Such rapid variability of a narrow (unresolved by the XMM-pn instrument) line has never been
reported in the past. These results are not easily explained in the standard cold reflection model where the narrow
line component is supposed to be produced far from the primary X-ray source (e.g. from the torus) and is thus
not expected to vary rapidly. Different interpretations are discussed.
Key words. Galaxies: individual: Mkn 841 – Galaxies: Seyfert – X-rays: galaxies
1. Introduction
The fluorescent Kα iron line is an important feature in the
high energy spectra of Seyfert galaxies. It is
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