Volume 373, Number 1, July I 2001
|Page(s)||1 - 11|
|Published online||15 July 2001|
Morphological fluctuations of large-scale structure: The PSCz survey
Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218, USA
2 Sektion Physik, Ludwig-Maximilians-Universität, Theresienstraße 37, 80333 München, Germany
3 Max-Planck-Institut für Metallforschung, Heisenbergstr. 1, 70569 Stuttgart, Germany
4 Institut für Theoretische und Angewandte Physik, Fakultät für Physik, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany
5 Teoretisk Astrofysik Center, Juliane Maries Vej 30, 2100 København Ø, Denmark
6 Theoretical Astrophysics Division, National Astronomical Observatory, 2-21-1 Osawa Mitaka, Tokyo 181-8588, Japan
7 Département de Physique Théorique, Université de Genève, 24 quai E. Ansermet, 1211 Genève, Switzerland
Corresponding author: M. Kerscher, firstname.lastname@example.org
Accepted: 24 April 2001
In a follow-up study to a previous analysis of the IRAS 1.2 Jy catalogue, we quantify the morphological fluctuations in the PSCz survey. We use a variety of measures, among them the family of scalar Minkowski functionals. We confirm the existence of significant fluctuations that are discernible in volume-limited samples out to 200h-1 Mpc. In contrast to earlier findings, comparisons with cosmological N-body simulations reveal that the observed fluctuations roughly agree with the cosmic variance found in corresponding mock samples. While two-point measures, e.g. the variance of count-in-cells, fluctuate only mildly, the fluctuations in the morphology on large scales indicate the presence of coherent structures that are at least as large as the sample.
Key words: large / scale structure of Universe / cosmology: observation / galaxies: statistics
© ESO, 2001
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