Systematic properties of clusters of galaxies in different cosmological scenarios
Thesis/Dissertation
·
OSTI ID:6457666
Rich clusters of galaxies and their environs are studied using N-body simulations in comparison with observations to examine whether any of their properties are sensitive to the cosmogonic scenario that led to their formation, and thus, could be used to help constrain the allowable initial-density fluctuations from which the presently observed large-scale structure of the universe might have arisen. Protoclusters are identified in large-scale cosmological simulations which represent a wide range of viable scenarios within the framework of the gravitational instability picture. Individual clusters are then resimulated with high resolution, and their systematic properties studied in detail. The density and velocity dispersion profiles of the simulated clusters are found to be quite similar, irrespective of the initial conditions. These profiles are in excellent agreement with those of a sample of Abell clusters. It is argued that the existence of such a universal profile reflects the efficiency of violent relaxation at erasing traces of the initial conditions, and also the secondary infall has not yet had a significant effect on clusters by the present epoch.
- Research Organization:
- Yale Univ., New Haven, CT (USA)
- OSTI ID:
- 6457666
- Country of Publication:
- United States
- Language:
- English
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