0120187

We propose short (90ksec) INTEGRAL observations of five bright Seyfert galaxies to be performed simultaneously with XMM-Newton. The principle goals of the INTEGRAL study are to measure with very high precision the spectral properties of the Compton reflection bump and the high energy cutoff. We have selected a range of Seyfert types in order to search for any systematic effects of the reflection due to the inclinations of these systems to the line of sight.The XMM-Newton simultaneous observations are essential to the achieve the goals of this proposal especially in measuring the reflection bump. A good knowledge of the complex 2-15keV spectrum is needed to model the gamma-ray spectrum with the precision required. In most cases JEM-X would only give four or five independent spectral points but the use of EPIC would nail down the X-ray tail with extremely high accuracy and in particular determine the ionisation state of the reflecting material.We will apply for XMM-Newton time in their AO2. The execution of this proposal would be conditional on the success of the XMM-Newton proposal. [truncated! Please see actual data for full text]