0320016

The study of hard X-ray emission (i.e. energy above 20 keV) of Seyfert galaxies is a powerful tool for extracting information on the intrinsic source emission properties as luminosity and spectral shape of the sources and on the intervening medium. Observations and measurements are fundamental for the study and understanding of the emission mechanisms operating in this type of objects and for testing unified models.At lower energies we can obtain information on column densities ionization and abundances of the surrounding matter which probe the environment around the central engine.We require one observation of 300 ks of the brightest Seyfert 2 galaxy NGC 4945. This observation will provide a good detection of the high energy spectra of NGC 4945 as well as Cen A and NGC 4507 present in its field of view allowing us precise spectral (primary power law reflection cutoff) and variability studies of these three bright Seyfert 2 galaxies. [truncated! Please see actual data for full text]