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The Sunyaev Zel'dovich effect: simulation and observation | | Pengjie Zhang
; Ue-Li Pen & Benjamin Wang
; | | Date: |
22 Dec 2001 | | Journal: | Astrophys.J. 577 (2002) 555-568 | | Subject: | astro-ph | | Affiliation: | Univ. of Toronto), Ue-Li Pen (CITA) & Benjamin Wang (UBC | | Abstract: | The Sunyaev Zel’dovich effect (SZ effect) is a complete probe of ionized baryons, 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 to compute the statistics of the thermal and kinetic SZ effect such as the power spectra and measures of non-Gaussianity. The thermal SZ power spectrum has a very broad peak at multipole $lsim 2000-10^4$ with temperature fluctuations $Delta T sim 15mu$K. The power spectrum is consistent with available observations and suggests a high $sigma_8simeq 1.0$ and a possible role of non-gravitational heating. The non-Gaussianity is significant and increases the cosmic variance of the power spectrum by a factor of $sim 5$ for $l<6000$. We explore optimal driftscan survey strategies for the AMIBA CMB interferometer and their dependence on cosmology. For SZ power spectrum estimation, we find that the optimal sky coverage for a 1000 hours of integration time is several hundred square degrees. One achieves an accuracy better than 40% in the SZ measurement of power spectrum and an accuracy better than 20% in the cross correlation with Sloan galaxies for $2000 | | Source: | arXiv, astro-ph/0201375 | | Services: | Forum | Review | PDF | Favorites | |
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