title: Evidence for a low-density universe from the relative velocities of galaxies
abstract: The motions of galaxies can be used to constrain the cosmological density parameter Omega and the clustering amplitude of matter on large scales. The mean relative velocity of galaxy pairs, estimated from 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.
authors.affiliation: Departement de Physique Theorique, Universite de Geneve, CH-1211 Geneve, Switzerland. Theory Group, CERN, CH-1211 Geneve 23, Switzerland. CENTRA, Instituto Superior Tecnico, Lisboa 1096 Codex, Portugal. Department of Physics and Astronomy,
authors.initials: R
authors.lastname: Juszkiewicz
authors.initials: PG
authors.lastname: Ferreira
authors.initials: HA
authors.lastname: Feldman
authors.initials: AH
authors.lastname: Jaffe
authors.initials: M
authors.lastname: Davis