TitleGroups of Galaxies in the Northern CfA Redshift Survey
AuthorsRamella, Massimo; Pisani, Armando; Geller, Margaret J.
AbstractWe use a friends-of-friends algorithm to identify loose groups from the northern CfA2 survey covering the region 8h≤α1950≤17h and 8.5°≤δ1950≤rr.5°. There are 406 groups; 149 of these contains five or more members within the survey. Geometric simulations guide our choice of the selection parameters; δp/p=80 is the limiting density contrast and V0 350 km s-1 is t ...
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