Radio-quiet QSO and the X-ray background

Details Radio-quiet QSO and the X-ray background Radio-quiet QSO and the X-ray background

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.239p..15f&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 239, Aug. 1, 1989, p. 15P-18P. Research supported by CA

Astronomy and Astrophysics

Astronomy

13

Background Radiation, Extraterrestrial Radiation, Quasars, X Ray Sources, Active Galactic Nuclei, Power Spectra, X Ray Absorption

Scientific paper

Upper limits on the extragalactic soft X-ray background flux (epsilon of about 0.1-0.3 keV) are used to constrain the contribution of X-ray sources with steep spectra to the X-ray background above 1 keV. The effective spectral index of the extragalactic X-ray background is less than 0.76 over the energy range 0.2 and 3.5 keV. Objects with power-law spectra of energy index 1.4, as recently found for a sample of radio-quiet QSO, cannot contribute more than 13 percent of the 2-10 keV X-ray background.

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