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Documentation: LEDA: parameter: lgg

Group membership: lgg

An early version of the database was used by Garcia ( Garcia et al. 1993; Garcia 1993) for a general study of group membership of all galaxies with a radial velocity less or equal to 5500 and an apparent magnitude brighter than bt=14. Two automatic algorithms were used simultaneously (percolation and hierarchy clustering methods) for producing very robust groups. From the whole sample 485 groups were build. They are identified by the acronym LGG (for Lyons Galaxy Group). For a galaxy, the LGG number lgg gives the group to which the galaxy belongs. The lgg number is available for 2702 galaxies.

It would be worth redoing the grouping with the present database which is considerable larger than when this work was made...

The lgg membership is not anymore given in the homogeneous catalogue.