Constraints on possible precursor AGN sources of the cosmic X-ray background

Details Constraints on possible precursor AGN sources of the cosmic X-ray background Constraints on possible precursor AGN sources of the cosmic X-ray background

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...322l...1b&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 322, Nov. 1, 1987, p. L1-L4.

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23

Active Galactic Nuclei, Background Radiation, Brightness Distribution, Cosmic X Rays, Galactic Evolution, Seyfert Galaxies, Big Bang Cosmology, Computational Astrophysics, Eddington Approximation, Electron-Positron Pairs, Quasars, Radiant Flux Density, X Ray Sources

Scientific paper

New limits on small-scale surface brightness fluctuations of the residual cosmic X-ray background are used to reevaluate the conjecture that unresolved precursor AGN sources could be the origin of the flux. The large number of these predominantly X-ray-emitting objects thereby required imposes that their lifetime be longer than previously considered. Attention is drawn to the fact that the reduction in the effective Eddington luminosity limit for such sources due to electron-positron pair opacity could have the effect of increasing their lifetime to an appropriate level.

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