Zel ’ dovich effect : simulations and observations
نویسنده
چکیده
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 ΛCDM 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 l ∼ 2000 − 10 4 with temperature fluctuations ∆T ∼ 15µK. The power spectrum is consistent with available observations and suggests a high σ 8 ≃ 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 ∼ 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 < l < 5000. For cluster searches, the optimal scan rate is around 280 hours per square degree with a cluster detection rate 1 every 7 hours, allowing for a false positive rate of 20% and better than 30% accuracy in the cluster SZ distribution function measurement.
منابع مشابه
Simulations of Sunyaev - Zel ’ dovich maps and their applications
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Richard Lieu , Jonathan P.D. Mittaz , and Shuang-Nan Zhang 2,1,3,4 Department of Physics, University of Alabama, Huntsville, AL 35899. Physics Department and Center for Astrophysics, Tsinghua University, Beijing, 100084, China. Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, P.O. Box 918-3, Beijing 100039, China. NASA Marshall Space Flight...
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