COBE background radiation anisotropies and large-scale structure in the universe

Details COBE background radiation anisotropies and large-scale structure in the universe COBE background radiation anisotropies and large-scale structure in the universe

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.258p...1e&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 258, no. 1, Sept. 1, 1992, p. 1P-6P. Research supported

Mathematics

Logic

457

Anisotropic Media, Background Radiation, Cosmic Background Explorer Satellite, Galactic Clusters, Relic Radiation, Astronomical Models, Dark Matter, Universe

Scientific paper

We discuss the constraints imposed on theoretical models by the COBE measurements of the microwave background anisotropies by observations of galaxy clustering, and by the observed streaming motions of galaxies. When normalized to match the COBE results, models with Omega = 1 and with more large-scale power than the standard cold dark matter (CDM) model predict lower streaming motions than are observed, but agree well with the dynamics of clustering on smaller scales. Unbiased Omega = 1 CDM models fit the COBE data and the streaming motions, but are less easily reconciled with galaxy clustering data on either small or large scales. Spatially flat CDM models with Omega of about 0.2 and a cosmological constant require the mass to be substantially more clustered than the galaxies in order to be consistent with COBE and with observed streaming motions. They are then in conflict, however, with dynamical measurements on smaller scales.

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