A measurement of the mass density of the universe

Details A measurement of the mass density of the universe A measurement of the mass density of the universe

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...307l...1l&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 307, Aug. 1, 1986, p. L1-L4.

Astronomy and Astrophysics

Astrophysics

142

Cosmology, Mass Distribution, Space Density, Universe, Data Sampling, Density (Mass/Volume), Error Analysis, Flux Quantization, Galactic Radiation, Red Shift

Scientific paper

This letter reports a new measurement of the density parameter Ω, which is the mass density of the universe relative to the critical density. The authors have measured the redshifts and fluxes of 1,000 field galaxies with a median redshift of 0.5. With this sample they determine Ω by measuring the volume element (to a scale factor H03) as a function of redshift. The measurement is sensitive to any kind of matter, luminous or dark. It is found that Ω = 0.9 (+0.7, -0.5), consistent with the Einstein-de Sitter model (Λ = 0, Ω = 1).

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