IAU01365
Presentation type requested: POSTER
MORPHOLOGY OF THE FILLED AND EMPTY REGIONS IN THE UNIVERSE
Xingfen Zhu
University of Science & Technology of China
The topology of the large scale structure in the universe is an important problem in cosmology. Now we apply a new method to investigate morphology of the filled and empty regions to the sample of 2dFGRS (100k database ). First, we extract a volume-limited sample (0.02<z<0.16) from 2df sample, then we partition the space into 12-rhombic-faced cells, which are either "filled" or "empty" according as they contain any 2df galaxies or not. 12 rhombic dodecahedron cell has more faces and more direction than cubic cell, therefore it may yield more information . The cell size is so chosen in distance as to give about equal numbers of filled and empty cell. A primary result is found: (i) the frequency distribution of like neighbours number (inner-inner or outer-outer) for both the filled and empty regions are greatly different from randomly binomial distribution, (ii) the filled cells prefer to be stay together with filled cells and empty cells, with empty cells, i.e., each has a tendency to be clustering, (iii)the degree of clustering of empty field is higher than of filled region. (iv) the galaxies , but not the voids, seem to exist in thin sheets.
Wu Yongfeng , Kiang Tao
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