Numerical and semi-analytic approaches to Sunyaev-Zeld'ovich effect
Studies of the Sunyaev-Zel’dovich (SZ) effect are reaching observational maturity,
and the detailed simulations are required to interpret upcoming data.
In this thesis, we present two approaches for simulating Sunyaev-Zel’dovich
maps. First, we use a hydrodynamical N-body code to generate simulated
maps. On the other hand, we also construct a recipe using semi-analytic
formalism to simulate SZ maps, that is, calculating the SZ anisotropies directly
using results from theoretical models or observations. The latter is
a time-saving method, and the influence of the physical mechanism on the
outputs can be easily seen since the applied models are substitutable. Although
there are many advantages for the semi-analytic method, it is much
less accurate than the N-body simulation. Therefore, we generate the SZ
maps, of size one square degree, with numerical and semi-analytic approaches
and compare them to see in what situations they are similar. We find that
the simulation results of cluster properties are in agreement with theoretical
model. Futhermore, we find out that the flux-limited number counts of
N-body and semi-analytic maps fit surprisingly well. With these results, the
semi-analytic method will be a powerful tool for model testing and to make
predictions for future SZ surveys such as PLANCK, AMiBA, SZA, AMI, etc.
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