Compact groups of galaxies (CGs) from the SDSS Data Release 6

Xin-Fa Deng 1 , Ji-Zhou He 1 , Xin-sheng Ma 1 , Peng Jiang 1 ,  and Xiao-Xun Tang 1
  • 1 School of Science, Nanchang University, Jiangxi, China, 330031

Abstract

From the volume-limited MAIN galaxy sample of the SDSS Data Release 6 (SDSS6), we have identified 1298 compact groups of galaxies (CGs) at the neighbourhood radius of R = 1.2 Mpc by three-dimensional cluster analysis. In order to compile the CG catalog, we also estimated velocity dispersion, virial radius, virial mass and crossing time of CGs. In addition, our results show that properties of galaxies may not correlate with merging frequencies.

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