The effects of energy injection into the intergalactic and intracluster media

Young, Owain Edward (2011) The effects of energy injection into the intergalactic and intracluster media. Doctoral thesis (DPhil), University of Sussex.

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This thesis presents the Millennium Gas suite of simulations - the largest cosmological
hydrodynamical simulations to date - and examines the effects of different prescriptions
for energy injection and radiative cooling on populations of galaxy clusters. We conclude
that the dfferences between populations of clusters generated by a simulation with an
epoch of preheating, and one with a continual injection of energy (feedback), are minimal
at the present day (both in good agreement with observations), but that the evolution of
the two populations of clusters differs. High redshift observations of cluster gas fractions
suggest that continual energy injection is the preferred method.
We examine possible causes of scatter in the cluster gas fraction, but are unable to
determine a cause, or combination of causes, of this scatter.
We combine the previously used feedback prescription with the same radiative cooling
prescription as was used in the preheating simulation. Although the bimodality is not
as clear as in observations, this model produces a sample containing both cool core and
non-cool core clusters.

Item Type: Thesis (Doctoral)
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QB Astronomy > QB0980 Cosmogony. Cosmology
Depositing User: Library Cataloguing
Date Deposited: 21 Dec 2011 10:25
Last Modified: 24 Aug 2015 13:17

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