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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

Abstract

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

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    © European Southern Observatory (ESO) 1998

    Online publication: April 15, 1998
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