The intergalactic medium temperature and Compton y parameter

Abstract

(Abridged) The precision modeling of the thermal Sunyaev Zeldovich (SZ) effect and future high accuracy measurements will provide a powerful way to constrain the thermal history of the universe. In this paper, we combine high resolution adiabatic hydro simulations and analytical models to provide a precision modeling of the gas density weighted temperature ${\bar{T}}_g$ and the mean SZ Compton $y$ parameter. Simulation artifacts are quantified and corrected and our analytical model passes tests of various simulations and is able to predict ${\bar{T}}_g$ and $\bar{y}$ to several percent accuracy. For low matter density $\Lambda$CDM cosmology, the present ${\bar{T}}_g$ is $0.32({\sigma }_8/0.84{)}^{3.05-0.15{\Omega }_m}({\Omega }_m/0.268{)}^{1.28-0.2{\sigma }_8}\mathrm{keV}$. The mean $y$ parameter is $2.6\times 10^{-6}({\sigma }_8/0.84{)}^{4.1-2{\Omega }_m}({\Omega }_m/0.268{)}^{1.28-0.2{\sigma }_8}$. The current upper limit of $y<1.5\times 10^{-5}$ measured by FIRAS has already ruled out combinations of high $σ_8\ga 1.1$ and high $Ω_m\ga 0.5$.

11 pages, 12 figures, MNRAS, in press. Added more discussions about the halo model prediction

References in corpus (11)

• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
• Stable clustering, the halo model and nonlinear cosmological power spectra
• High Resolution Observations of the CMB Power Spectrum with ACBAR
• Entropy Injection as a Global Feedback Mechanism
• A Moving Frame Algorithm for High Mach Number Hydrodynamics
• A Primer on Eulerian Computational Fluid Dynamics for Astrophysics
• Precision era of the kinetic Sunyaev-Zeldovich effect: simulations, analytical models and observations and the power to constrain reionization
• Sunyaev-Zeldovich Fluctuations from the First Stars?
• Effects of Preheated Clusters on the CMB Spectrum
• The Effect of Radiative Cooling on the Sunyaev-Zel'dovich Cluster Counts and Angular Power Spectrum: Analytic Treatment
• The effect of cluster magnetic field on the Sunyaev Zeldovich power spectrum

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