Abstract
The angular autocorrelation function of the X-ray background in the energy band 4-12 keV has been explored on scales of 2°-25° using 132 exposures obtained with the Large Area Counter (LAC) on board the GINGA satellite. No significant signal is found over the whole range. An upper limit at 2° of 10 −4 is found for the autocorrelation function at the 95 per cent confidence level, significantly lower than previous values obtained in the 2-10 keV band at 3° separation. This upper limit is shown to constrain clustering on scales ∼ 10-300 Mpc in the high-redshift (z ∼ 0.1-5) Universe, and in particular the cluster-cluster and AGN-AGN correlation functions
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