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Date and Time of the Query: 2018-12-16 T09:58:26 PST
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For refcode 2005ApJ...630..759M:
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NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2005ApJ...630..759M Galaxy Groups in the Third Data Release of the Sloan Digital Sky Survey Manuel E. Merchan and Ariel Zandivarez Abstract. We present a new sample of galaxy groups identified in the Sloan Digital Sky Survey Data Release 3. Following previous works, we use the well-tested friends-of-friends algorithm developed by Huchra and Geller, which takes into account the number density variation due to the apparent magnitude limit of the galaxy catalog. To improve the identification, we implement a procedure to avoid the artificial merging of small systems in high-density regions and then apply an iterative method to recompute the group centers position. As a result, we obtain a new catalog with 10,864 galaxy groups with at least four members. The final group sample has a mean redshift of 0.1 and a median velocity dispersion of 230 km s^-1^. Key words: Galaxies: Clusters: General
There are 78273 NED objects in this reference.
Please click here for ADS abstract

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