Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-03-27
Astronomy and Astrophysics
Astrophysics
9 pages, 3 figures, To appear in Proc. of "X-ray astronomy 2000", (Palermo Sep. 2000), Eds. R. Giacconi, L. Stella, S. Serio,
Scientific paper
Deep observations of the X-ray Sky have now resolved most of the X-ray Background. Obscured active galaxies are a key component. The obscured objects which dominate at fluxes above $10^{-15}\ergpcmsqps$ are discussed and models in which the growth of wind-blowing active nuclei determine both black hole and galaxy mass are presented. The power from accretion is large and can easily influence the gas in a host galaxy, as well as heat the intergalactic medium.
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