Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-12-05
Astronomy and Astrophysics
Astrophysics
17 revtex pages, including 8 postscript and 3 jpeg figures. Submitted to Phys. Rev. D. Figures also available at http://www.as
Scientific paper
The hot gas embedded in the large-scale structures in the Universe produces secondary fluctuations in the Cosmic Microwave Background (CMB). Because it is proportional to the gas pressure integrated along the line of sight, this effect, the thermal Sunyaev-Zel'dovich (SZ) effect, provides a direct measure of large-scale structure and of cosmological parameters. We study the statistical properties of this effect using both hydrodynamical simulations and analytical predictions from an extended halo model. The Adaptive Mesh Refinement scheme, used in the newly developed code RAMSES, provides a dynamic range of 4 order of magnitudes, and thus allows us to significantly improve upon earlier calculations. After accounting for the finite mass resolution and box size of the simulation, we find that the halo model agrees well with the simulations. We discuss and quantify the uncertainty in both methods, and thus derive an accurate prediction for the SZ power spectrum in the 10^2
Refregier Alexandre
Teyssier Romain
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