2001/07/31 by Giorgio Matt, G. Matt, Matt, Giorgio
Engineering · Physics and Astronomy · #Astrophysical Phenomena and Observations #Gamma-ray bursts and supernovae #Particle Accelerators and Free-Electron Lasers #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0107584
review talk at the conference "Issues in Unification of AGNs"
arxiv created 2001/07/31 · arxiv updated 2009/12/01
The properties of Compton-thick AGN are reviewed, with particular emphasis on BeppoSAX hard X-ray observations. I also discuss evidence for the presence of Compton-thick, circumnuclear matter in unobscured AGN, and I briefly introduce the HELLAS2XMM 5-10 keV survey, discussed in more details in other contributions to this volume.