期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 352, 期 4, 页码 1232-1244出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2004.08017.x
关键词
galaxies : statistics; cosmology : theory; large-scale structure of Universe
We measure moments of the galaxy count probability distribution function in the Two-degree Field Galaxy Redshift Survey (2dFGRS). The survey is divided into volume-limited subsamples in order to examine the dependence of the higher-order clustering on galaxy luminosity. We demonstrate the hierarchical scaling of the averaged p-point galaxy correlation functions, (xi) over bar (p), up top = 6. The hierarchical amplitudes, S-p = (xi) over bar (p)/(xi) over bar (p-1)(2), are approximately independent of the cell radius used to smooth the galaxy distribution on small to medium scales. On larger scales we find that the higher-order moments can be strongly affected by the presence of rare, massive superstructures in the galaxy distribution. The skewness S-3 has a weak dependence on luminosity, approximated by a linear dependence on log luminosity. We discuss the implications of our results for simple models of linear and non-linear bias that relate the galaxy distribution to the underlying mass.
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