Mathematics – Logic
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pnas...90.4822r&link_type=abstract
Proceedings of the National Academy of Sciences of the United States of America, Volume 90, Issue 11, pp. 4822-4826
Mathematics
Logic
3
Scientific paper
Methods for determining the cosmological density parameter Ω_0 from large-scale flows are reviewed. Very consistent results using infrared astronomical satellite (IRAS) data have been obtained by different groups with completely independent methods. The two main methods involve either using maps of the galaxy distribution to predict the peculiar velocity of the Local Group or directly comparing the density field inferred from the IRAS galaxy distribution with the peculiar velocities inferred from optical distance methods. All methods based on IRAS data are consistent with Ω_0 = 0.7 ± 0.1, or if Ω_0 = 1, with a bias parameter b = 1.2 ± 0.1. Various problems associated with the method are discussed, including the issue of which waveband is optimum for such studies, bias, the universality of the luminosity function, and the convergence of the dipole. The lower values of Ω_0 obtained in optical studies may indicate a higher degree of bias toward regions of high total matter-density for elliptical galaxies. A new study using the whole IRAS point source catalog to 0.6 jansky is described, which gives results consistent with other IRAS studies.
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