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Title:
A measurement of the mass density of the universe
Authors:
Loh, E. D.; Spillar, E. J.
Affiliation:
AA(Princeton University, NJ), AB(Princeton University, NJ)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 307, Aug. 1, 1986, p. L1-L4. (ApJL Homepage)
Publication Date:
08/1986
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
COSMOLOGY, MASS DISTRIBUTION, SPACE DENSITY, UNIVERSE, DATA SAMPLING, DENSITY (MASS/VOLUME), ERROR ANALYSIS, FLUX QUANTIZATION, GALACTIC RADIATION, RED SHIFT
DOI:
10.1086/184717
Bibliographic Code:
1986ApJ...307L...1L

Abstract

This letter reports a new measurement of the density parameter Omega, 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 Omega 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 Omega = 0.9 (+0.7, -0.5), consistent with the Einstein-de Sitter model (Lambda = 0, Omega = 1).

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