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Date and Time of the Query: 2018-09-25 T22:35:38 PDT
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For refcode 2015AJ....149..171T:
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Copyright by American Astronomical Society. Reproduced by permission
2015AJ....149..171T Galaxy Groups: A 2MASS Catalog Tully, R. Brent Abstract. A galaxy group catalog is built from the sample of the 2MASS Redshift Survey almost complete to K_s_ = 11.75 over 91% of the sky. Constraints in the construction of the groups were provided by scaling relations determined by close examination of well defined groups with masses between 10^11^ and {{10}^15^} {{M}_o_}. Group masses inferred from K_s_ luminosities are statistically in agreement with masses calculated from application of the virial theorem. While groups have been identified over the full redshift range of the sample, the properties of the nearest and farthest groups are uncertain and subsequent analysis has only considered groups with velocities between 3000 and 10,000 km s^-1^. The 24,044 galaxies in this range are identified with 13,607 entities, 3461 of them with two or more members. A group mass function is constructed. The Sheth--Tormen formalism provides a good fit to the shape of the mass function for group masses above 6 {{h}^-1^}x {{10}^12^} {{M}_o_} but the count normalization is poor. Summing all the mass associated with the galaxy groups between 3000 and 10,000 km s^-1^ gives a density of collapsed matter as a fraction of the critical density of {{{Omega}}_collapsed_}=0.16. Key words: dark matter, galaxies: clusters: general, galaxies: luminosity function, mass function, large-scale structure of universe
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