Abstract
The baryon fraction of galaxy clusters in numerical simulations is found
to be dependent on the cluster formation method. In all cases, the gas
is antibiased compared with the dark matter. However, clusters formed
hierarchically are found to be more depleted in baryons than clusters
formed non-hierarchically. There is a depletion of 10 to 15 per cent for
hierarchically formed clusters, while the depletion is less than 10 per
cent for those clusters formed non-hierarchically. This difference is
dependent on the mass of the clusters. The mean baryon enrichment
profile for the hierarchically formed clusters shows an appreciable
baryon enhancement around the virial radius not seen in the clusters
formed without substructure. If this phenomenon applies to real
clusters, it implies that determinations of the baryon fractions in
clusters of galaxies require data extending beyond the virial radius of
the clusters in order to achieve an unbiased value.
Original language | English |
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Pages (from-to) | 834-838 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 315 |
Publication status | Published - 1 Jul 2000 |
Keywords
- GALAXIES: CLUSTERS: GENERAL
- COSMOLOGY: THEORY
- DARK MATTER