Astronomy & Astrophysics

A&A 474, 783-791 (2007)
DOI: 10.1051/0004-6361:20066407

The main galaxy groups from the SDSS data release 5

Xin-Fa Deng, Ji-Zhou He, Peng Jiang, Cheng-Hong Luo, and Ping Wu

School of Science, Nanchang University, Jiangxi 330031, PR China
e-mail: xinfadeng@163.com

(Received 16 September 2006 / Accepted 3 August 2007)

Abstract
Aims. We investigate the correlations between galaxy properties and environment.
Methods.From the main galaxy sample of the SDSS Data Release 5, we have extracted 11 163 groups at the linking length R₀ = 0.2 $\times$ $\bar{n}^$ = 1.97 Mpc by the three-dimensional friends-of-friends (FOF) algorithm, where $\bar{n}$ is the mean galaxy density, and compare basic properties of member galaxies of main galaxy groups with those of the main galaxy sample and isolated galaxies in each redshift bin.
Results.The luminosities and sizes of galaxies are almost independent of environment, but morphologies and colors are correlated with environment-especially galaxy morphologies.

Key words: galaxies: fundamental parameters -- cosmology: large-scale structure of Universe

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