Fluctuations in the IRAS 1.2 Jy Catalogue

Details Fluctuations in the IRAS 1.2 Jy Catalogue Fluctuations in the IRAS 1.2 Jy Catalogue

1997-04-02

arxiv.org/abs/astro-ph/9704028v3

Astron.Astrophys.333:1-12,1998

Astronomy and Astrophysics

Astrophysics

13 pages, Latex, 24 eps-figures included, using aa.cls and epsf.sty; matching published version in A&A

Scientific paper

An analysis of the IRAS 1.2 Jy redshift catalogue with emphasis on the separate examination of northern and southern parts (in galactic coordinates) is performed using a complete set of morphological descriptors (Minkowski functionals), nearest neighbour distributions and the variance of the galaxy counts. We find large fluctuations in the clustering properties as seen in a large difference between the northern and southern parts of the catalogue on scales of 100Mpc/h. These fluctuations remain discernible even on the scale of 200Mpc/h. We also identify sparse sampling as a major source of ``apparent homogenization''. Tests on observational selection effects concerning luminosity, colour and redshift-space distortion support the significance of these large-scale fluctuations.

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