Spherical harmonic analysis of IRAS galaxies - Implications for the Great Attractor and cold dark matter

Details Spherical harmonic analysis of IRAS galaxies - Implications for the Great Attractor and cold dark matter Spherical harmonic analysis of IRAS galaxies - Implications for the Great Attractor and cold dark matter

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.256..229s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 256, no. 2, May 15, 1992, p. 229-237.

Astronomy and Astrophysics

Astronomy

58

Cosmology, Dark Matter, Galactic Clusters, Infrared Astronomy, Spherical Harmonics, Angular Distribution, Astronomical Maps, Infrared Astronomy Satellite, Statistical Analysis, Universe

Scientific paper

The paper analyzes the angular distribution of more than 8000 galaxies observed by IRAS on scales of 4-180 deg, by expansion in spherical harmonics. This technique makes it possible to study both cosmography and statistics of the local universe. The harmonic analysis illustrates the existence of the 'tug of war' between the Great Attractor/Centaurus complex and the Perseus-Pisces supercluster. A new concentration in Puppis, behind the Galactic plane, is revealed by the harmonic analysis, in accord with a recent redshift survey. The angular power spectrum in the IR galaxy sample is found to be in agreement with the standard CDM model, when normalized properly according to the IRAS galaxy correlation function on small scales, so that the variance of galaxy number counts in an 8/h-Mpc sphere is about 0.7. A likelihood analysis, where the normalization and shape of the power spectrum are allowed to vary, slightly favors a low-density CDM model when these parameters are 0.8 and 0.3, respectively.

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