Astronomy and Astrophysics – Astronomy
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....85l...9c&link_type=abstract
Astronomy and Astrophysics, vol. 85, no. 3, May 1980, p. L9, L10. Consiglio Nazionale delle Ricerche
Astronomy and Astrophysics
Astronomy
12
Background Radiation, Quasars, X Ray Astronomy, X Ray Sources, Astronomical Catalogs, Astronomical Observatories, Data Acquisition, Data Processing, Light (Visible Radiation), Luminous Intensity, Spectrum Analysis
Scientific paper
The contributions of discrete, evolving, extragalactic X-ray sources to the X-ray background are investigated on the basis of data from the Einstein Observatory deep survey and optical and X-ray studies of catalogued quasars. Comparisons of the deep survey data and studies of the correlations of the X-ray and optical quasar fluxes are shown to imply that the average two-point energy index that determines the relative luminosities of sources at given optical and X-ray frequencies must be larger than 1.5 for sources evolving like quasars. This result can be explained by the catalogued quasars being fainter at 2 keV than previously estimated, or by a difference in the X-ray properties of radio-loud and radio-quiet quasars. In either case, it is concluded that any major contribution to the X-ray background associated with discrete evolving sources must come from objects very faint in both the optical and X-ray regions.
Cavaliere Alfonso
Danese Lugi
de Zotti Gainfranco
Franceschini Alberto
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