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ISRN Astronomy and Astrophysics
Volume 2012 (2012), Article ID 171829, 7 pages
http://dx.doi.org/10.5402/2012/171829
Research Article

Three-Dimensional Filamentation Analysis of SDSS DR5 Survey

1Department of Astronomy, University of Science and Technology of China, Jinzhai Road 96, Anhui Province, Hefei 230026, China
2Department of Physics, University of Maine, Orono, ME 04469, USA
3Department of Mathematics & Statistics Institute for Molecular Biophysics, University of Maine, Orono, ME 04469, USA

Received 5 April 2012; Accepted 10 May 2012

Academic Editors: A. Ferrari and H. Zhao

Copyright © 2012 Yongfeng Wu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We introduce a new method to calculate the multiscale 3D filamentation of SDSS DR5 galaxy clusters and also applied it to N-body simulations. We compared the filamentation of the observed versus mock samples in metric space on scales from 8 Mpc to 30 Mpc. Mock samples are closer to the observed sample than random samples, and one of the mock samples behaves better than another one. We also find that the observed sample has a large filamentation value at a scale of 10 Mpc, which is not found from either mock samples or random samples.