Mathematics – Logic
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apl%26c..33..127g&link_type=abstract
Astrophysical Letters and Communications, Vol. 33, Nos. 1 - 5, p. 127 - 132
Mathematics
Logic
Galaxy Groups: N-Body Simulations
Scientific paper
The authors simulate the formation and the subsequent evolution of groups of galaxies of mass 2×1013Msun, taking into account the secondary infall expected in a critical universe. They then discuss in terms of the Press & Schechter formalism the statistics of such groups and their number evolution in different cosmological scenarios. From the N-body simulations they find that merging is effective in building at least one central remnant in a few crossing times soon after the collapse of the central overdense region of the group which, in current cosmologies, occurs at z ≡ 1 - 0.35. The authors then look for compact groups in the ensemble of simulations, and compare their statistical properties with Hickson's compact groups. The results show that compact group formation is an ongoing and frequent process in a critical universe, where the presence of secondary infall is a necessary ingredient.
Cavaliere Alfonso
Governato Fabio
Tozzi Paolo
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