Obscured AGN and the X-ray background.

Details Obscured AGN and the X-ray background. Obscured AGN and the X-ray background.

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999adspr..23.1161a&link_type=abstract

Advances in Space Research, Vol. 23, No. 5 - 6, p. 1161 - 1166

Physics

Active Galactic Nuclei: X-Ray Background

Scientific paper

There is growing evidence that the hard X-ray background (XRB) can be explained by a large population of obscured AGN. The author reviews some of the results of deep X-ray surveys, and in particular he discusses the nature of the X-ray luminous emission-line galaxies which have emerged at the faintest X-ray fluxes. If obscured AGN do explain the XRB, a direct implication is that the majority of the energy produced by accretion in the Universe is absorbed and not emitted directly. Deep submillimetre surveys with SCUBA have attracted a lot of attention, with the potential to allow one an unobscured view dust-enshrouded star formation at high redshift. It has generally been assumed that these sources are purely high redshift star forming galaxies, but if models for the XRB are correct then a significant fraction (≡20%) could contain a luminous AGN.

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