Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-09-10
Astronomy and Astrophysics
Astrophysics
8 pages, 6 figures, presented at the meeting: "Issues in unifications of AGNs" Marciana Marina, May 2001; eds. R. Maiolino, A.
Scientific paper
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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