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High-resolution simulations of cluster formation
Please use this identifier to cite or link to this item:
http://hdl.handle.net/1860/1911
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| 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
http://hdl.handle.net/1860/1911 |
| Appears in Collections: | Faculty Research and Publications (Physics)
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