On the Virgo supercluster and the mean mass density of the universe

Details On the Virgo supercluster and the mean mass density of the universe On the Virgo supercluster and the mean mass density of the universe

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...238l.113d&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 238, June 15, 1980, p. L113-L116.

Mathematics

Logic

109

Anisotropy, Cosmology, Galactic Clusters, Mass Distribution, Relic Radiation, Universe, Density Distribution, Galactic Rotation, Hubble Constant

Scientific paper

The paper discusses recent measurements of the anisotropy of the microwave background radiation of the local Hubble flow which suggest that the local group of galaxies has a motion of 300-500 km/s directed toward Virgo. If this velocity is generated by the Virgo supercluster, it provides an effective test of the cosmological parameter omega. The mean overdensity toward the Virgo cluster was computed to be about 2.0 plus or minus 0.03 based on a catalog of redshift data complete to m(b) = 14.0. When combined with a nonlinear spherically symmetric flow model around Virgo, the omega was 0.4 plus or minus 0.1; thus the measured mass-to-light ratio of the universe continues to rise with increasing scale size of measurement.

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