Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-07-24
Mon.Not.Roy.Astron.Soc. 324 (2001) 450
Astronomy and Astrophysics
Astrophysics
14 a4 pages, 18 eps figures, submitted to MNRAS
Scientific paper
10.1046/j.1365-8711.2001.04330.x
We have extracted over 400 clusters, covering more than 2 decades in mass, from three simulations of the TCDM cosmology. This represents the largest, uniform catalogue of simulated clusters ever produced. The clusters exhibit a wide variety of density-profiles. Only a minority are well-fit in their outer regions by the widely used density profile of Navarro, Frenk & White (1977). Others have steeper outer density profiles, show sharp breaks in their density profiles, or have significant substructure. If we force a fit to the NFW profile, then the best-fit concentrations decline with increasing mass, but this is driven primarily by an increase in substructure as one moves to higher masses. The measured temperature-mass relations for properties measured within a sphere enclosing a fixed overdensity all follow the self-similar form, T\propto M^{2/3}, however the normalisation is lower than in observed clusters. The temperature-mass relations for properties measured within a fixed physical radius are significantly steeper then this. Both can be accurately predicted using the NFW model.
Couchman H. M. P.
Edge Alastair C.
Jenkins Alejandro
Muanwong Orrarujee
Onuora L.
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