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

doi:10.1126/science.287.5450.109

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Astronomy

Science 7 January 2000:
Vol. 287. no. 5450, pp. 109 - 112
DOI: 10.1126/science.287.5450.109

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

R. Juszkiewicz, ¹^* P. G. Ferreira, ¹²³ H. A. Feldman, ⁴ A. H. Jaffe, ⁵ M. Davis ⁵

The motions of galaxies can be used to constrain the cosmological density parameter $Omega$ and the clustering amplitude of matteron large scales. The mean relative velocity of galaxy pairs, estimatedfrom the Mark III survey, indicates that $Omega$ = 0.35_0.25^+0.35. If the clustering of galaxies is unbiased on large scales, $Omega$ = 0.35 ± 0.15, so that an unbiased Einstein-de Sitter model ( $Omega$ = 1) is inconsistent with the data.

¹ Département de Physique Théorique, Université de Genève, CH-1211 Genève, Switzerland.
² Theory Group, CERN, CH-1211 Genève 23, Switzerland.
³ CENTRA, Instituto Superior Tecnico, Lisboa 1096 Codex, Portugal.
⁴ Department of Physics and Astronomy, University of Kansas, Lawrence, KS 66045, USA.
⁵ Center for Particle Astrophysics, University of California, Berkeley, CA 94720, USA.
^* On leave from Copernicus Astronomical Center, 00-716 Warsaw, Poland.

To whom correspondence should be addressed. E-mail: pgf{at}astro.ox.ac.uk