Multiple redshifts

Around about 1980, William Tifft, a radio astronomer at the University of Arizona in Tucson, had the wild idea that, perhaps, the cosmological redshifts of galaxies had preferences for multiples of some basic unit. Subsequently, he looked and made two claims [1,2] ... 

On extending the search to pairs or groups of associated galaxies the same phenomenon was observed. The redshift differences bunched up near multiples of the originally observed jump, j. It was correctly inferred that "if redshift is solely a Doppler effect, then the differences between the measured values for members of pairs should show no jumps". 

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