Optical characteristics of young quasars as sources of the cosmic X-ray background

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Background Radiation, Cosmic Rays, Galactic Nuclei, Quasars, X Ray Sources, Active Galactic Nuclei, Cosmology, Energy Spectra, Galactic Evolution, Line Spectra, Lyman Alpha Radiation, Spectral Energy Distribution, X Ray Spectra

Scientific paper

The sources which dominate the thermal cosmic X-ray background cannot have X-ray spectra similar to the power laws measured for bright active galactic nuclei. The authors pursue the optical consequences of this disparity by considering a standard model of the photoexcitation and heating of the line-emitting gas surrounding a central source (e.g., such as a quasar). The optical line emission to be associated with compact young quasar sources having the same X-ray spectrum as the X-ray background is found to be substantially different from that characteristic of typical quasars. Implications on quasar source counts and the identification of such new objects are discussed.

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