IRAS galaxies versus POTENT mass - Density fields, biasing, and Omega

Details IRAS galaxies versus POTENT mass - Density fields, biasing, and Omega IRAS galaxies versus POTENT mass - Density fields, biasing, and Omega

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...412....1d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 412, no. 1, p. 1-21.

Statistics

Computation

136

Cosmology, Density Distribution, Galactic Clusters, Infrared Astronomy Satellite, Universe, Bias, Computational Astrophysics, Monte Carlo Method, Red Shift

Scientific paper

A comparison of the galaxy density field extracted from a complete redshift survey of IRAS galaxies brighter than 1.936 Jy with the mass-density field reconstructed by the POTENT procedure from the observed peculiar velocities of 493 objects is presented. A strong correlation is found between the galaxy and mass-density fields; both feature the Great Attractor, part of the Perseus-Pisces supercluster, and the large void between them. Monte Carlo noise simulations show that the data are consistent with the hypotheses that the smoothed fluctuations of galaxy and mass densities at each point are proportional to each other with the 'biasing' factor of IRAS galaxies, b(I), and that the peculiar velocity field is related to the mass-density field as expected according to the gravitational instability theory. Under these hypotheses, the two density fields can be related by specifying b(I) and the cosmological density parameter, Omega.

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