Reflection-dominated hard X-ray sources and the X-ray background

Details Reflection-dominated hard X-ray sources and the X-ray background Reflection-dominated hard X-ray sources and the X-ray background

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.242p..14f&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 242, Jan. 1, 1990, p. 14P-16P. Research supported by th

Astronomy and Astrophysics

Astronomy

75

Background Radiation, Quasars, X Ray Sources, X Ray Spectra, Absorption Spectra, Energy Spectra, Far Ultraviolet Radiation, Red Shift

Scientific paper

The spectrum of the X-ray background is flat in the 2-10 keV range and has a break at about 30 keV. It is shown here that the spectrum of hard X-rays scattered by Thomson-thick material gives a good fit to the background above 10 keV when redshifted to z = 1.5. An evolutionary model covering a range of redshifts explains the background spectrum over a wider energy band. The necessary reflection-dominated sources may occur when massive black holes grow by accretion. A large fraction of the power generated by the sources must emerge as thermal radiation in the EUV and may be the intergalactic ionizing flux required to explain the properties of QSO absorption lines.

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