Journal
ASTRONOMY & ASTROPHYSICS
Volume 373, Issue 1, Pages 1-11Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20010604
Keywords
large-scale structure of Universe; cosmology : observation; galaxies : statistics
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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.
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