Hydrodynamic Simulations of the Sunyaev‐Zeldovich Effect(s)

We have performed a sequence of high resolution hydrodynamic simulations ofstructure formation in a LCDM model to study the thermal and kineticSunyaev-Zel'dovich (SZ) effects. Including only adiabatic gas physics, wedemonstrate that our simulations for the thermal effect are converged down tosub-arcminute scales. In this model, the angular power spectrum of CMBanisotropies induced by the thermal effect peaks at l~10^4, and reaches anamplitude just below current observational upper limits. Fluctuations due tothe kinetic effect are a factor of ~30 lower in power and peak at slightlysmaller angular scales. We identify individual SZ sources and compute theircounts as a function of source strength and angular size. We present apreliminary investigation of the consequences of an early epoch of energyinjection which tends to suppress power on small angular scales, while givingrise to additional power on largescales from the reheated IGM at high redshift.