Double galaxy investigations. II – The redshift periodicity in optically observed pairs

Abstract

The new sample of optically observed double galaxies is tested for the 72 km/sec periodicity. The periodicity is present in the 200 pair high weight sample at or above the 99% confidence level. Detection varies between subsamples in accord with variation in data uncertainty as expected. Uncertainties in delta-V inferred from the visibility of the periodicity are in close accord with directly determined internal delta-V errors. The result is not dependent upon inclusion or exclusion of the zero peak.

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