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Fig. 12


Example of three groups in the group catalogue of Tully (2015b) that dissolve into several groups in our FoF catalogue. Galaxy positions are shown in RA-Dec (upper panels) and redshift-Dec (lower panels) coordinates. In each panel, all galaxies belong to one Tully group. Separate colours represent separate FoF groups in our catalogue. Grey crosses designate group members in Tully catalogue that do not belong to any FoF group. They are mostly located in group outskirts and/or are separated in the redshift space. These examples show that our FoF algorithm with membership refinement suggests that a single Tully group may contain separable subcomponents and possible outliers.

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