Mathematics – Logic
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977natur.270..396l&link_type=abstract
Nature, vol. 270, Dec. 1, 1977, p. 396-399.
Mathematics
Logic
45
Light Speed, Radio Galaxies, Relativistic Velocity, Cosmology
Scientific paper
Observations of the radio galaxy 3C120 reported by Cohen et al. (1976) are considered and a new interpretation is given of the observed events. The new interpretation removes the discrepancy of two different superluminal velocities. It is shown that the second expansion velocity is caused by a misinterpretation and that the events in the considered galaxy fit the theory perfectly. The investigation makes use of the old 'light echo theory' described by Perrine (1903), taking into account a simple modification for a case in which the object is not observed at rest but nearby at a large redshift. It is found that the Hubble constant must be changed. Attention is given to an application to 3C273 and statistics of superluminal expansions. The cosmological implications of the new value for the Hubble constant are discussed.
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