Statistics – Computation
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...296..299e&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 296, Sept. 15, 1985, p. 299-318.
Statistics
Computation
6
Astronomical Models, Big Bang Cosmology, Galactic Clusters, Many Body Problem, Universe, Virial Theorem, Computational Astrophysics, Eccentric Orbits, Galactic Evolution, Kepler Laws, Mass Distribution, Orbital Elements
Scientific paper
The degree of virialization of isolated pairs of galaxies is investigated in the N-body simulations of Efstathiou and Eastwood (1981) for open and critical universes, utilizing the three-dimensional information available for both position and velocity. The models are described, including the equation of scaling the model to the real universe and the method of extracting pair samples. The classical virial theorem is reformulated in an expanding universe by explicitly subtracting out the underlying Hubble expansion. It is shown that nearly half of the point masses in the simulations double up to form isolated pairs whose dynamics is dominated by their own two-body force, and that more than three-quarters of these pairs are bound in very eccentric orbits. The investigation is then extended to include all pairs of galaxies, regardless of isolation. It is found that both the classical virial theorem and Peebles's (1976) 'cosmic virial theorem' provide reasonable mass estimates for nonisolated pairs.
Evrard August E.
Yahil Amos
No associations
LandOfFree
Virialization in N-body models of the expanding universe. I - Isolated pairs. II - All pairs does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Virialization in N-body models of the expanding universe. I - Isolated pairs. II - All pairs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Virialization in N-body models of the expanding universe. I - Isolated pairs. II - All pairs will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-798689