Precursor active galaxies and the cosmic X-ray background

Details Precursor active galaxies and the cosmic X-ray background Precursor active galaxies and the cosmic X-ray background

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981stin...8120000b&link_type=abstract

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Astronomy and Astrophysics

Astronomy

Active Galaxies, Background Radiation, Cosmic X Rays, Galactic Evolution, Galaxies, X Ray Astronomy, Black Holes (Astronomy), Gamma Rays, Nonthermal Radiation

Scientific paper

It is argued that the cosmic X-ray background (CXB) is not dominated by sources that are usual active galaxies or quasars. A comparable number of objects, young galaxies at z approximately 4 containing massive black holes surrounded by hot optically thin accretion disks, constitute the precursor active galaxies (PAG) postulated here for producing the thermal type spectrum required for the CXB. An evolutionary track for such PAG objects is described which would lead to the active galaxies observed as individual nonthermal sources. Unresolved emission from active galaxies at z 1 could then readily account for most of the nonthermal background observed in the gamma ray band.

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