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Using an approximately volume-limited LRG sample of SDSS DR6, we investigate the basic properties of groups identified by Berlind et al. [A.A. Berlind, J. Frieman, D.H. Weinberg, et al., ApJS 167 (2006) 1] ‘s algorithm and Davis et al. [M. Davis, G. Efstathiou, C.S. Frenk, S.D.M. White, ApJ 292 (1985) 371]’s algorithm, respectively. It is found that the basic properties of groups strongly depend on...
In order to decrease the effect of radial selection function, we have constructed a volume-limited sample that extends to Z max =0.12, and limits the absolute magnitude region: −22.40⩽M⩽−20.97. It contains 55,054 galaxies. By three-dimensional cluster analysis, two isolated galaxy samples are extracted from volume-limited sample at the dimensionless neighbourhood radii r=1.2 and r=1.4. We...
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