Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..797b&link_type=abstract
In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 2: AGN and the X Ray Background p 797-801 (SEE N90-258
Astronomy and Astrophysics
Astronomy
4
Active Galactic Nuclei, Background Radiation, Cosmic Rays, Galactic Evolution, Galactic Structure, Brightness Distribution, Red Shift, Variations, X Ray Sources, X Ray Spectra
Scientific paper
The principal sources of the cosmic X-ray background (CXB) can be objects indicative of a physically early stage of active galactic nuclei (AGN) evolution. Such an evolutionary scenario is examined by using the HEAO-1 A2 X-ray selected sample of bright AGN as a diagnostic of anisotropies in the unresolved background. The observed limit on CXB global anisotropy is used to place an upper bound on the present-epoch volume emissivity of unresolved X-ray sources. Considering the A2 AGN count, CXB surface brightness fluctuations observed at higher energies (via HEAO-1 A4) suggest that present-epoch AGN could have the broadband spectral structure needed for the redshifted contributions of more luminous AGN with this same spectrum to account for the entire CXB.
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