Evidence for a low-density Universe from the relative velocities of galaxies

Details Evidence for a low-density Universe from the relative velocities of galaxies Evidence for a low-density Universe from the relative velocities of galaxies

2000-01-04

arxiv.org/abs/astro-ph/0001041v2

Science 287 (2000) 109-112

Astronomy and Astrophysics

Astrophysics

12 pages, 2 figures, to appear in the Jan.7 issue of ``Science''; In the original version, the title appeared twice. This prob

Scientific paper

10.1126/science.287.5450.109

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 +0.35/-0.25. 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.

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