Statistics – Computation
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.249..698c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 249, April 15, 1991, p. 698-703. Research supported by
Statistics
Computation
25
Active Galactic Nuclei, Angular Correlation, Autocorrelation, Background Radiation, Cosmic X Rays, Galactic Clusters, Ginga Satellite, Computational Astrophysics, Spectral Correlation
Scientific paper
The angular autocorrelation function of the X-ray background in the energy band 4-12 keV has been explored on scales of 2-25 deg using 132 exposures obtained with the Large Area Counter on board the GINGA satellite. No significant signal is found over the whole range. An upper limit at 2 deg of 0.0001 is found for the autocorrelation function at 95 percent confidence level, significantly lower than previous values obtained in the 2-10 keV band at 3 deg separation. This upper limit is shown to constrain clustering on scales about 10-300 Mpc in the high-redshift (z about 0.1-5) universe, and in particular the cluster-cluster and AGN-AGN correlation functions.
Barcons Xavier
Butcher Jackie A.
Carrera Francicso J.
Fabian Andrea C.
Stewart Gordon C.
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