Investigating the origin of hard X-ray spectra in broad-line AGN

We have found a population of hard spectrum Xray AGN which have broadlines. These may be bright examples of the hard sources that dominate the sourcecounts in the 210virgulkeV band, and therefore produce most of the Xray emission inthe Universe. These sources are an exciting and surprising discovery because thehard Xray AGN were expected to have narrow lines. We propose to observe asample of these AGN with XMM to find out why their Xray emission is hard. EPICspectra will enable us to distinguish between absorption of an otherwisestandard soft spectral shape, and intrinsically hard emission, perhaps producedby advection dominated accretion. If they are not absorbed, popular models forthe origin of the Xray background will need to be rewritten. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]