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- P. A. Thomas, J. M. Colberg, +8 authors Simon D. M. White
- 1998

We investigate the internal structure of clusters of galaxies in high-resolution N-body simulations of 4 different cosmologies. There is a higher proportion of disordered clusters in critical-density than in low-density universes, although the structure of relaxed clusters is very similar in each. Crude measures of substructure, such as the shift in the… (More)

- Frazer R. Pearce, P. A. Thomas, +5 authors J. M. Colberg
- PDP
- 1997

We model a one-dimensional shock-tube using smoothed particle hydrodynamics and investigate the consequences of having finite shock-width in numerical simulations caused by finite resolution of the codes. We investigate the cooling of gas during passage through the shock for three different cooling regimes. For a theoretical shock temperature of 10K, the… (More)

We calculate the cooling times at constant density for halos with virial temperatures from 100K to 1×105 K that originate from a 3σ fluctuation of a CDM power spectrum in three different cosmologies. Our intention is to determine the first objects that can cool to low temperatures, but not to follow their dynamical evolution. We identify two generations of… (More)

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