Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 316, Issue 1, Pages L13-L16Publisher
BLACKWELL SCIENCE LTD
DOI: 10.1046/j.1365-8711.2000.03733.x
Keywords
cosmology : observations; diffuse radiation; X-rays : general
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Measurements of the intensity of the cosmic X-ray background (XRB) carried out over small solid angles are subject to spatial variations caused by the discrete nature of the XRB. This cosmic variance can account for the dispersion of XRB intensity values found within the ASCA, BeppoSAX and ROSAT missions separately. However, there are differences among the values obtained in the different missions, which are not caused by spatial fluctuations but, more likely, by systematic cross-calibration errors. Prompted by recent work which shows that the ROSAT PSPC has calibration differences from all the other missions, we compute a Bayesian estimate for the XRB intensity at 1 keV of 10.0(-0.9)(+0.6) keV cm(-2) s(-1) sr(-1) keV(-1) (90 per cent confidence errors) using the ASCA and BeppoSAX data points. However, this value is still significantly larger than the HEAO-1 intensity measured over many thousands of square degrees (8 keV cm(-2) s(-1) sr(-1) keV(-1)).
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