The power spectra of IRAS galaxies and of Abell clusters

Details The power spectra of IRAS galaxies and of Abell clusters The power spectra of IRAS galaxies and of Abell clusters

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...406....6j&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 406, no. 1, p. 6-11.

Astronomy and Astrophysics

Astronomy

28

Galactic Clusters, Infrared Astronomy Satellite, Power Spectra, Cosmic Background Explorer Satellite, Red Shift

Scientific paper

Power spectra of IRAS galaxies and Abell clusters are measured by analyzing the 2 Jy IRAS redshift survey and two redshift samples of Abell clusters. The variance of IRAS galaxies is found to obey a power law up to the largest possible wavelength which the survey can explore. The variance of Abell clusters has the same slope as that of IRAS galaxies for lambda less than 100/h Mpc but has an amplitude about 10 times higher, which supports the 'linear' biasing mechanism as the origin of rich clusters. At larger wavelengths, the variance of Abell clusters falls more rapidly than the power law. A suitable formula for the variance is found under the 'linear' biasing assumption. Assuming a biasing factor of 1.5 for IRAS galaxies, the Sachs-Wolfe effect with the above variance correctly produces the temperature quadrupole observed in the COBE experiment.

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