Modeling the Outskirts of Galaxy Clusters with Cosmological Simulations

Details Modeling the Outskirts of Galaxy Clusters with Cosmological Simulations Modeling the Outskirts of Galaxy Clusters with Cosmological Simulations

2011-01-06

arxiv.org/abs/1101.1322v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

4 pages, 3 figures, to appear in proceedings of "Non-thermal phenomena in colliding galaxy clusters" (Nice, France, Nov 2010)

Scientific paper

We present cosmological simulations of galaxy clusters, with focus on the cluster outskirts. We show that large-scale cosmic accretion and mergers produce significant internal gas motions and inhomogeneous gas distribution ("clumpiness") in the intracluster medium (ICM) and introduce biases in measurements of the ICM profiles and the cluster mass. We also show that non-thermal pressure provided by the gas motions is one of the dominant sources of theoretical uncertainties in cosmic microwave background secondary anisotropies. We briefly discuss implications for cluster cosmology and future prospects for understanding the physics of cluster outskirts using computer simulations and multi-wavelength cluster surveys.

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