X-ray monitoring of NGCvirgul4507: X-ray absorption by Broad Line Clouds

We propose a new XMMNewton monitoring of the Xray obscured AGN in NGCvirgul4507,with the aim of testing a scenario where the variable Xray absorption is due tothe broad emission line clouds. The identification of these two components issuggested by our previous monitoring of a few other sources (NGC 1365, NGC 4151,UGC 4203), where rapid Xray absorption variability, suggestive of an extremelycompact Xray absorber, has been found by chance. The new campaign we proposeis for the first time based on a precise prediction, rather than on a blindsearch, and will therefore provide a strong test of the general validity of thisnew scheme for the structure of the AGN circumnuclear medium. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]