Physics
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981sci...213..825v&link_type=abstract
Science, vol. 213, Aug. 21, 1981, p. 825-830.
Physics
9
Abundance, Chronology, Cosmology, Isotopes, Size Determination, Universe, Galactic Clusters, Galactic Evolution, Galactic Rotation, Hubble Constant, Radioactive Age Determination
Scientific paper
Accumulating evidence is shown to indicate that the expansion of the universe may exhibit a large local perturbation due to the gravitational attraction of the Virgo supercluster. Different types of observations still produce conflicting evidence about the velocity with which the Local Group of galaxies is falling into the Virgo cluster, with estimates lying between zero and 500 km/sec. The resulting ambiguity in the flow pattern for nearby galaxies makes values of the Hubble parameter H that are derived from galaxies with radial velocities less than 2000 km/sec uncertain, and restricts determinations of H to distant galaxies whose distances are especially uncertain. The best estimate yielded at present by the inverse of the Hubble parameter is a maximum time scale in the range of 10-20 million years.
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