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Obscured Accretion and Black Holes

A. C Fabian

astro-pharXiv:astro-ph/0109156

Abstract

The evidence for obscured AGN and in particular for obscured quasars is discussed. The spectrum and source modelling of the X-ray Background suggests that most massive black holes grow by obscured accretion. A possible major growth phase which is Compton thick is explored and shown to be difficult to detect directly with current instruments.

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