Omega from the anisotropy of the redshift correlation function

Details Omega from the anisotropy of the redshift correlation function Omega from the anisotropy of the redshift correlation function

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993egte.conf....9h&link_type=abstract

In NASA. Ames Research Center, The Evolution of Galaxies and Their Environment p 9-14 (SEE N93-26706 10-90)

Astronomy and Astrophysics

Astronomy

Anisotropy, Cosmology, Functions (Mathematics), Galaxies, Harmonics, Prediction Analysis Techniques, Quadrupoles, Red Shift, Statistical Correlation, Distortion, Infrared Astronomy Satellite

Scientific paper

Peculiar velocities distort the correlation function of galaxies observed in redshift space. In the large scale, linear regime, the distortion takes a characteristic quadrupole plus hexadecapole form, with the amplitude of the distortion depending on the cosmological density parameter omega. Preliminary measurements are reported here of the harmonics of the correlation function in the CfA, SSRS, and IRAS 2 Jansky redshift surveys. The observed behavior of the harmonics agrees qualitatively with the predictions of linear theory on large scales in every survey. However, real anisotropy in the galaxy distribution induces large fluctuations in samples which do not yet probe a sufficiently fair volume of the Universe. In the CfA 14.5 sample in particular, the Great Wall induces a large negative quadrupole, which taken at face value implies an unrealistically large omega 20. The IRAS 2 Jy survey, which covers a substantially larger volume than the optical surveys and is less affected by fingers-of-god, yields a more reliable and believable value, omega = 0.5 sup +.5 sub -.25.

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