Mathematics – Probability
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...334l..59b&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 334, Nov. 15, 1988, p. L59-L62.
Mathematics
Probability
61
Astronomical Models, Big Bang Cosmology, Dark Matter, Galactic Clusters, Probability Density Functions, Baryons, Normal Density Functions, Statistical Tests, Velocity Distribution
Scientific paper
Several scenarios for the growth of cosmic structure are tested against recent observations of large-scale peculiar velocities with the velocity field being represented as a dipole flow, a spherical flow toward a great attractor, and a minimal cylindrical model proposed by Faber and Burstein (1988). It is shown that if the observationally derived flow models are correct, then all the theoretical scenarios have difficulties. For the standard Omega = 1 biased cold dark matter (CDM) scenario, earlier conclusions based on the dipole flow model that the CDM predictions fail by a large margin are confirmed. A drastic revision of the existing fits to the observational data would be required to save this scenario. The isocurvature baryon models (with Omega = 0.4) fare much better: they naturally lead to large-scale flows. However, these models have difficulty reproducing the observed velocity gradients. The cylindrical flow model constrains theories less than the spherical Great Attractor model does, illustrating the importance of extending present surveys to greater redshift.
Bertschinger Edmund
Juszkiewicz Roman
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