Abstract
KAROJI and Nottale1 have compared galaxies situated behind or inside clusters with those whose light does not encounter any important cluster of galaxies. They suggested that either light emitted by distant galaxies is redshifted when passing through clusters of galaxies, or distant sources appear more luminous when seen through intermediate clusters of galaxies, which could act as gravitational lenses. Here we examine the magnitude of the lens effect for clusters of galaxies, and find it unlikely that the observational effect claimed by Karoji and Nottale can be explained in this way.
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References
Karoji, H., and Nottale, L., Nature, 259, 31 (1976).
Dyer, C. C., thesis, Univ. Toronto (1973).
Dyer, C. C., and Roeder, R. C., Astrophys. J., 189, 167 (1974).
King, I. R., Astrophys. J. Lett., 174, L123 (1972).
Clark, E. E., Mon. Not. R. astr. Soc., 158, 233 (1972).
Sandage, A. R., Astrophys. J., 202, 563 (1975).
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DYER, C., ROEDER, R. Clusters of galaxies as gravitational lenses?. Nature 260, 764–765 (1976). https://doi.org/10.1038/260764a0
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DOI: https://doi.org/10.1038/260764a0
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