Large scale structure in the SDSS galaxy survey

Free access article

Issue		A&A Volume 418, Number 1, April IV 2004


Page(s)		7 - 23
Section		Cosmology (including clusters of galaxies)
DOI		http://dx.doi.org/10.1051/0004-6361:20031780

A&A 418, 7-23 (2004)
DOI: 10.1051/0004-6361:20031780

Large scale structure in the SDSS galaxy survey

A. Doroshkevich^{1, 2}, D. L. Tucker³, S. Allam^{3, 4} and M. J. Way^{1, 5}

¹ Theoretical Astrophysics Center, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark
² Keldysh Institute of Applied Mathematics, Russian Academy of Sciences, 125047 Moscow, Russia
³ Fermi National Accelerator Laboratory, MS 127, PO Box 500, Batavia, IL 60510 USA
⁴ Department of Astronomy, New Mexico State University, Las Cruces, NM 88003-8001 USA
⁵ NASA Ames Research Center, Space Sciences Division, MS 245-6, Moffett Field, CA 94035, USA

(Received 15 July 2003 / Accepted 23 December 2003)

Abstract
The Large Scale Structure in the galaxy distribution is investigated using Data Release 1 of the Sloan Digital Sky Survey. Using the Minimal Spanning Tree technique we have extracted sets of filaments, of wall-like structures, of galaxy groups, and of rich clusters from this unique sample. The physical properties of these structures were then measured and compared with the statistical expectations based on Zel'dovich theory.

The measured characteristics of galaxy walls were found to be consistent with those for a spatially flat $\Lambda$ CDM cosmological model with $\Omega_m\approx 0.3$ and $\Omega_\Lambda \approx 0.7$ , and for Gaussian initial perturbations with a Harrison - Zel'dovich power spectrum. Furthermore, we found that the mass functions of groups and of unrelaxed structure elements generally fit well with the expectations from Zel'dovich theory. We also note that both groups and rich clusters tend to prefer the environments of walls, which tend to be of higher density, rather than the environments of filaments, which tend to be of lower density.

Key words: cosmology: large-scale structure of the Universe -- surveys

Offprint request: D. L. Tucker, dtucker@fnal.gov

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