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Astron. Astrophys. 333, 1-12 (1998)

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Fluctuations in the IRAS 1.2 Jy catalogue

Martin Kerscher 1, Jens Schmalzing 1, 2, Thomas Buchert 1 and Herbert Wagner * 1

1 Ludwig-Maximilians-Universität, Theresienstrasse 37, D-80333 München, Germany
2 Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1, D-85740 Garching, Germany

Received 6 October 1997 / Accepted 23 December 1997


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 100 [FORMULA]. These fluctuations remain discernible even on the scale of 200 [FORMULA]. 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.

Key words: large-scale structure of Universe – cosmology: theory – cosmology: observations – galaxies: clusters: general

* emails: kerscher, jens, buchert, wagner@stat.physik.uni-muenchen.de

Send offprint requests to: T. Buchert

© European Southern Observatory (ESO) 1998

Online publication: April 15, 1998