The Sunyaev‐Zeldovich Effect: Simulations and Observations

The Sunyaev Zel'dovich effect (SZ effect) is a complete probe of ionizedbaryons, the majority of which are likely hiding in the intergalactic medium.We ran a $512^3$ $\Lambda$CDM simulation using a moving mesh hydro code tocompute the statistics of the thermal and kinetic SZ effect such as the powerspectra and measures of non-Gaussianity. The thermal SZ power spectrum has avery broad peak at multipole $l\sim 2000-10^4$ with temperature fluctuations$\Delta T \sim 15\mu$K. The power spectrum is consistent with availableobservations and suggests a high $\sigma_8\simeq 1.0$ and a possible role ofnon-gravitational heating. The non-Gaussianity is significant and increases thecosmic variance of the power spectrum by a factor of $\sim 5$ for $l<6000$. We explore optimal driftscan survey strategies for the AMIBA CMBinterferometer and their dependence on cosmology. For SZ power spectrumestimation, we find that the optimal sky coverage for a 1000 hours ofintegration time is several hundred square degrees. One achieves an accuracybetter than 40% in the SZ measurement of power spectrum and an accuracy betterthan 20% in the cross correlation with Sloan galaxies for $2000

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