Unabsorbed type 2 Seyfert galaxies: a challenge for Unified Models

A campaign of simultaneous Xray and optical observations of unabsorbed Seyfert2s has already proved successful in the AO5,leading to the discovery of thefirst .true. Seyfert 2 without broad line region.We therefore intend to pursueour strategy,proposing to observe with XMMNewton a sample of bonafide.Seyfert 2 galaxies with no Xray absorption.The selected sources are aconservative subsample taken from the Panessa & Bassani (2002) sample,includingonly Seyfert 2s where no column density in excess of the Galactic one has everbeen observed in the Xrays,within sensitive limits.The primary goal of thisproposal is to find more objects unabsorbed in the Xrays and without broadoptical lines,which represent a serious challenge to simple AGN Unification Models. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]