“School of Astronomy”
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| Paper IPM / Astronomy / 14347 |
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We use the millennium simulation for studying the evolution of groups of galaxies over time. We find
fossil and non-fossil groups as well as old and young groups at redshift z = 0 and follow them back in
time to investigate the evolution of their parameters, such as mass assembly, luminosity gap and halo
mass concentration. We find that fossils assemble a larger fraction of their mass at z = 0 than controls.
The magnitude gaps between fossil and non-fossil groups are not the same because of major and minor
mergers, in old and young groups as well. We also find that WMAP1 and WMAP7 cosmologies lead to
the same evolutionary history for fossil and control groups
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