NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-03-25 T15:13:37 PDT
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For refcode 1993A&AS..100...47G:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1993A&AS..100...47G General study of group membership. II. Determination of nearby groups A.M. Garcia Observatoire de Lyon, 69230 Saint-Genis Laval, France Received July 30; accepted October 26, 1992 Abstract. - We present a whole sky catalog of nearby groups of galaxies taken from the Lyon-Meudon Extragalactic Database. From the 78000 objects in the database, we extracted a sample of 6392 galaxies, complete up to the limiting apparent magnitude B_0_ = 14.0. Moreover, in order to consider solely the galaxies of the local universe, all the selected galaxies have a known recession velocity smaller than 5500 km s^-1^. Two methods were used in group construction: a Huchra-Geller-derived percolation method and a Tully-derived hierarchical method. Each method gave us one catalog. These were then compared and synthesized to obtain a single catalog containing the most reliable groups. There are 485 groups of a least three members in the final catalog. Key words: galaxies: clustering - numerical methods - catalogs
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