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تسجيل مستخدم جديدA rapidly variable narrow X-ray iron line in Mkn 841
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تأليف
P.O. Petrucci
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We report on the detection of a rapidly variable narrow Fe K$alpha$ 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 $sim$ 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.
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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. T
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Mkr 841 is a bright Seyfert 1 galaxy known to harbor a strong soft excess and a variable K$alpha$ iron line. It has been observed during 3 different periods by XMM for a total cumulated exposure time of $sim$108 ks. We present in this paper a broad b
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