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The intergalactic medium temperature and Compton y parameter | | Pengjie Zhang
; Ue-Li Pen
; Hy Trac
; | | Date: |
4 Feb 2004 | | Journal: | Mon.Not.Roy.Astron.Soc. 355 (2004) 451 | | Subject: | astro-ph | | Affiliation: | Fermilab), Ue-Li Pen (CITA), Hy Trac (Univ. of Toronto | | 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 $ar{T}_g$ 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 $ar{T}_g$ and $ar{y}$ to several percent accuracy. For low matter density $Lambda$CDM cosmology, the present $ar{T}_g$ is $0.32 (sigma_8/0.84)^{3.05-0.15Omega_m}(Omega_m/0.268)^{1.28-0.2sigma_8} {
m keV}$. The mean $y$ parameter is $2.6 imes 10^{-6} (sigma_8/0.84)^{4.1-2Omega_m}(Omega_m/0.268)^{1.28-0.2sigma_8}$. The current upper limit of $y<1.5 imes 10^{-5}$ measured by FIRAS has already ruled out combinations of high $sigma_8ga 1.1$ and high $Omega_mga 0.5$. | | Source: | arXiv, astro-ph/0402115 | | Services: | Forum | Review | PDF | Favorites | |
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