Constraints to the QSO contribution to the X-ray background

Details Constraints to the QSO contribution to the X-ray background Constraints to the QSO contribution to the X-ray background

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....97..269c&link_type=abstract

Astronomy and Astrophysics, vol. 97, no. 2, Apr. 1981, p. 269-273. Research supported by the Consiglio Nazionale delle Ricerche

Astronomy and Astrophysics

Astrophysics

21

Background Radiation, Cosmic X Rays, Heao 2, Quasars, X Ray Sources, Extragalactic Radio Sources, Visible Spectrum

Scientific paper

Based on an analysis of the HEAO-2 satellite deep survey, it is predicted that radio-quiet QSOs having blue magnitudes of up to 20 should emit, in the few keV range, a power on the order of less than 0.2 of that emitted in the few-thousand A range; a factor of less than one-third relative to radio-loud objects, and contributing less than 20 percent of the X-ray background at 2 keV. The conditions under which the faint QSOs could fill up the remaining quota, or at least produce a dominant contribution while still complying with such constraints as those set by the optical counts, the X-ray fluctuations and the total counts of star-like objects, are discussed. These constraints are severe, and suggest that no more than half of the 2 keV background could be produced by QSOs.

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