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Issue A&A
Volume 373, Number 1, July I 2001
Page(s) 1 - 11
Section Cosmology
DOI http://dx.doi.org/10.1051/0004-6361:20010604



A&A 373, 1-11 (2001)
DOI: 10.1051/0004-6361:20010604

Morphological fluctuations of large-scale structure: The PSCz survey

M. Kerscher1, 2, K. Mecke3, 4, J. Schmalzing5, 2, C. Beisbart2, T. Buchert6, 7, 2 and H. Wagner2

1  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

(Received 15 January 2001 / Accepted 24 April 2001)

Abstract
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

Offprint request: M. Kerscher, kerscher@theorie.physik.uni-muenchen.de




© ESO 2001


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