Volume 397, Number 1, January I 2003
|Page(s)||63 - 70|
|Section||Cosmology (including clusters of galaxies)|
|Published online||11 December 2002|
The mass function of the Las Campanas loose groups of galaxies
Tartu Observatory, 61602 Tõravere, Estonia
2 Tuorla Observatory, Väisäläntie 20, 21500 Piikkiö, Finland
3 Fermi National Acceleration Laboratory, M8 127, PO Box 500, Batavia, IL 60510, USA
4 Astrophysical Institute Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
Corresponding author: P. Heinämäki, firstname.lastname@example.org
Accepted: 10 October 2002
We have determined the mass function of loose groups of galaxies in the Las Campanas Redshift Survey. Loose groups of galaxies in the LCRS range in mass from to . We find that the sample is almost complete for masses in the interval . Comparison of the observed mass function with theoretical mass functions obtained from N-body simulations shows good agreement with a CDM model with the parameters , and the amplitude of perturbations about . For smaller masses the mass function of LCRS loose groups flattens out, differing considerably from the group mass function found by Girardi & Giuricin (2000) and from mass functions obtained by numerical simulations.
Key words: cosmology: observations / cosmology: large-scale structure of Universe
© ESO, 2003
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