3rd Italian-Sino Chinese Participants |
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Page 9 of 9
17. Zhu,
Xing-Fen (朱杏芬)
Center for Astrophysics
University of Science and Technology of China
96 Jinzai Lu
Hefei, Anhui 230026
P.R.China
Email: zhuxf@ustc.edu.cn
Fax: 86-551-3631760
Title of talk: Probing the topology of
empty and filled regions of galaxies in the Universe
Abstract: The topology of the large scale
structure in the universe is an important problem in cosmology. Now we apply
Rhombic Cell Analysis to investigate morphology of filled and empty regions of
galaxies in the IRAS/PSCz Catalogue. First we extract
some volume-limited subsamples, then we partition the
space into 12-rhombic-faced cells, which are either "filled" or
"empty" according as they contain any 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. We
find that: (i) the filled cells prefer to be stay
together with filled cells, and empty cells prefer to be stay together with
empty cells, i.e., each has a tendency to be clustering at smaller depthts(<=100
h-1Mpc) and such a flocking gradually decreases to insignificance around
200h-1Mpc, (ii)at any depths the degree of clustering of empty field is higher
than of filled region. (iii) the galaxies, also the empty
cells, have a considerable excess of "thin sheets" over
"string".
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