Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the intensity of the cosmic X-ray background   Measurements of the intensity of the cosmic X-ray background (XRB) carried
out over small solid angles are subject to spatial variations due to 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 due to spatial fluctuations but, more likely,
to systematic cross-calibration errors. Prompted by recent work which shows
that ROSAT PSPC has calibration differences with all the other missions, we
compute a bayesian estimate for the XRB intensity at 1 keV of
10.0^{+0.6}_{-0.9} keV/cm2/s/keV/sr (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/cm2/s/keV/sr).

19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math