| Issue |
A&A
Volume 397, Number 1, January I 2003
|
|
|---|---|---|
| Page(s) | 63 - 70 | |
| Section | Cosmology (including clusters of galaxies) | |
| DOI | https://doi.org/10.1051/0004-6361:20021498 | |
| Published online | 11 December 2002 | |
The mass function of the Las Campanas loose groups of galaxies
1
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, pekka@aai.ee
Received:
18
February
2002
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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