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Please use this identifier to cite or link to this item: http://hdl.handle.net/1860/1911

Title: High-resolution simulations of cluster formation
Authors: Goldberg, David
Brainerd, Tereasa
Villumsen, Jens Verner
Keywords: Cosmology: Dark Matter;Cosmology: Large-Scale Structure Of The Universe;Cosmology: Theory;Methods: Numerical
Issue Date: 16-Jun-1997
Publisher: American Astronomical Society
Citation: The Astrophysical Journal.
Abstract: The formation history of rich clusters is investigated using a hybrid N-body simulation in which high spatial and mass resolution can be achieved self-consistently within a small region of a very large volume. The evolution of three massive clusters is studied via mass accretion, spherically-averaged density profiles, three-dimensional and projected shapes, and degree of substructure. Each cluster consists of 4 × 105 particles at the present epoch and in the case that rich cluster evolution is well-described by a 1-parameter family, the simulations have sufficient resolution to demonstrate this. At z = 0 the clusters have similar masses, M(r 1.5h−1Mpc) 2 × 1015h−1M⊙, and similar spherically-averaged density profiles, however markedly different formation histories are observed. No single, dominant pattern is apparent in the time variation of the mass accretion rate, the cluster shape, or the degree of substructure. Although not a statistically large sample, these objects suggest that the detailed formation history of rich clusters cannot be characterized by a simple 1-parameter family. These results suggest that the use of observations of rich clusters over a wide range of redshifts to constrain cosmological parameters may not be entirely straightforward.
URI: http://arxiv.org/abs/astro-ph/9706165v1
Appears in Collections:Faculty Research and Publications (Physics)

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