Mathematics – Probability
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.251..267h&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 251, July 15, 1991, p. 267-280.
Mathematics
Probability
5
Astronomical Models, Galactic Mass, Gravitational Fields, Infrared Astronomy Satellite, Maximum Likelihood Estimates, Baryons, Dark Matter, Galactic Clusters, Power Spectra, Probability Density Functions, Red Shift
Scientific paper
A general method for examining velocity-potential minima is given and then applied to the great attractor (GA) situated in the direction of the Hydra-Centaurus supercluster. The large potential depth of a GA greatly constrains the density parameter Omega if the potential on large scales is Gaussian. The IRAS redshift survey and the UCSB South Pole microwave background experiment are found to yield similar constraints for the value of Omega, which must be greater than 0.5. A large mass concentration for the GA is not expected for high values of Omega, and relationships with cold dark matter and the bias parameter are examined and found to suggest that the GA is not the local minimum of the velocity potential. Based on the depth and proximity of the GA it is concluded that the universe is dominated by nonbaryonic matter and observational evidence indicate that Omega can equal 1.
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