2001/09/10 by A. C. Fabian, A. C Fabian, Fabian, A. C
Physics and Astronomy · #Accretion (finance) #Astronomy #Astrophysics #Geology #Physics #Relativity and Gravitational Theory #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0109156
published in arXiv (Cornell University) (Cornell University) · 8 pages, 6 figures, presented at the meeting: "Issues in unifications of AGNs" Marciana Marina, May 2001; eds. R. Maiolino, A. Marconi and N. Nagar
arxiv created 2001/09/10 · openalex publication_date 2001/09/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.