Abstract
The fluctuations in X-ray background intensity that would be generated by clusters or superclusters of galaxies exceed those observed. It may be that the X-ray background arises from low-luminosity objects which are distributed much more smoothly and are more numerous than bright optical galaxies. Hierarchical universe models in which the distribution of X-ray sources follows the cosmological mass distribution are ruled out.
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WOLFE, A., BURBIDGE, G. Can the Lumpy Distribution of Galaxies be reconciled with the Smooth X-ray Background?. Nature 228, 1170–1174 (1970). https://doi.org/10.1038/2281170a0
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DOI: https://doi.org/10.1038/2281170a0
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