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The Ohio State University
College of Mathematical & Physical Sciences
Department of Astronomy Colloquium Series 2006/7
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Thursday, October 26, 3:30 p.m.
2015 McPherson Laboratory
Cosmological simulations of clusters of
galaxies: status, problems, challenges
Prof. Andrey Kravtsov
Kavli Institute for Cosmological Physics
The University of Chicago
I will describe high-resolution self-consistent cosmological simulations
of clusters forming in the concordance Cold Dark Matter model with
vacuum energy. The resolution of the simulations is sufficiently high
to resolve formation and evolution of cluster galaxies and their impact
on cluster gas. We use these simulations to study the effects of galaxy
formation on the global properties of clusters, such as the shape of
cluster dark matter halo and its density profile, the baryon fractions,
gas density and temperature profiles. I will present comparisons of
simulations results with the recent X-ray Chandra, Sunyaev-Zeldovich,
and optical observations of clusters with highlights of both successes
and problems of the models. I will show that despite complexities of
their formation and uncertainties in their modeling, clusters of
galaxies both in observations and numerical simulations are remarkably
regular outside of their core region (~5% of the virial radius), which
holds great promise for their use as cosmological probes.
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