Cold dark matter versus baryon-dominated universes - Comparison with peculiar velocity and acceleration measurements

Details Cold dark matter versus baryon-dominated universes - Comparison with peculiar velocity and acceleration measurements Cold dark matter versus baryon-dominated universes - Comparison with peculiar velocity and acceleration measurements

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...397...26d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 397, no. 1, p. 26-31.

Astronomy and Astrophysics

Astronomy

4

Baryons, Cosmology, Dark Matter, Elliptical Galaxies, Infrared Astronomy Satellite, Red Shift, Astronomical Models, Perturbation Theory, Velocity Measurement

Scientific paper

We discuss how to compare different theoretical models against observations of elliptical galaxy peculiar velocities and IRAS galaxy accelerations. The method is based on a likelihood ratio analysis of the available data and allows one to test pairs of models, one against the other. In principle, it is possible to identify the model most consistent with the observational data. We find that a flat biased cold dark matter model performs much worse than a low-density model, either cold dark matter or isocurvature baryon dominated. The last two models are both consistent with the observations, and are statistically indistinguishable. However, the recent sparse-sampled QDOT redshift survey seems to indicate that an Omega(0) = 0.7 cold dark matter model should be preferred.

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