Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-08-23
Astrophys.J.608:636-646,2004
Astronomy and Astrophysics
Astrophysics
Paper in aastex 5.0 format and 9 figures. Replace a new version with figures and typos corrected
Scientific paper
10.1086/420874
We examine the peculiar velocity distribution function of galaxies in cosmological many-body gravitational clustering. Our statistical mechanical approach derives a previous basic assumption and generalizes earlier results to galaxies with haloes. Comparison with the observed peculiar velocity distributions indicates that individual massive galaxies are usually surrounded by their own haloes, rather than being embedded in common haloes. We then derive the density of energy states, giving the probability that a randomly chosen configuration of N galaxies in space is bound and virialized. Gravitational clustering is very efficient. The results agree well with the observed probabilities for finding nearby groups containing N galaxies. A consequence is that our local relatively low mass group is quite typical, and the observed small departures from the local Hubble flow beyond our group are highly probable.
Leong Bernard
Saslaw William
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