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3rd Italian-Sino Chinese Participants Print E-mail

 

 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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