PROBING THE ORIGIN OF THE RAPIDLY VARIABLE IRON LINE OF MKN 841

We propose to perform a continuous 75 ks XMMNewton observation of the SeyfertMkn 841 to elucidate the origin of its very peculiar iron line complex. An XMMobservation done in 2001 has revealed a line which was unresolved by the EPICpninstrument, which then disappeared in an observation 12 hours later. There is nosimple explanation for this behaviour. If the line is truly narrow and, e.g.,originates from the torus, it should not be rapidly variable. If it is from theaccretion disk, it should not be narrow. A long XMM observation will providecrucial information to fulfill the purpose of this proposal. It will permit 1)to obtain a high signaltonoise line profile to search for any broad wings, and2) to study the rapid line variability behaviour to better understand its origin. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]