Evidence for a Low-Density Universe from the Relative Velocities of Galaxies

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Science  07 Jan 2000:
Vol. 287, Issue 5450, pp. 109-112
DOI: 10.1126/science.287.5450.109

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The motions of galaxies can be used to constrain the cosmological density parameter Ω and the clustering amplitude of matter on large scales. The mean relative velocity of galaxy pairs, estimated from the Mark III survey, indicates that Ω = 0.35−0.25 +0.35. If the clustering of galaxies is unbiased on large scales, Ω = 0.35 ± 0.15, so that an unbiased Einstein–de Sitter model (Ω = 1) is inconsistent with the data.

  • * On leave from Copernicus Astronomical Center, 00-716 Warsaw, Poland.

  • To whom correspondence should be addressed. E-mail: pgf{at}

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