Title: OBSERVATIONS OF TYPE II SEYFERT GALAXIES

Title: OBSERVATIONS OF TYPE II SEYFERT GALAXIES

Proposal ID: 0120047
Subject category: Extragalactic Object
Principal investigator: Deluit
Institute: INTEGRAL Science Data Center

Abstract

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 and necessary 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 informations on column densities, ionisation and abundances of the surrounding matter which probe the environment around the central engine. We require three observations each of 100 ks of the brightest Seyfert 2 galaxy NGC 4945 and one observation of 400 ks of NGC 5506. These observations will provide a good detection of the high energy spectra which will allow us precise spectral and variability studies. These observations will also provide the basis for a comparison of Seyfert 1 and Seyfert 2 galaxies at high energy to test the unified model which predicts the same behaviour (spectra, variability) for both types.