Other
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...245l..53f&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 245, Apr. 15, 1981, p. L53-L57.
Other
24
Cosmology, Galactic Clusters, Galactic Evolution, Galactic Structure, Radial Velocity, Astronomical Models, Density Measurement, Hubble Constant, Red Shift
Scientific paper
The radial velocities of cluster members of two rich, large superclusters have been measured in order to probe the supercluster mass densities, and simple evolutionary models have been computed to place limits upon the mass density within each supercluster. These superclusters represent true physical associations of size of about 100 Mpc seen presently at an early stage of evolution. One supercluster is weakly bound, the other probably barely bound, but possibly marginally unbound. Gravity has noticeably slowed the Hubble expansion of both superclusters. Galaxy surface-density counts and the density enhancement of Abell clusters within each supercluster were used to derive the ratio of mass densities of the superclusters to the mean field mass density. The results strongly exclude a closed universe.
Bartko Frank
Ciardullo Robin
Ford Holland C.
Harms Richard J.
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