Zel ’ dovich effect : simulation and observation
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 the 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 ∼ 10 4 with temperature fluctuations ∆T ∼ 24µK. The power spectrum is consistent with available observations and suggests a high σ 8 ≃ 1.0 and possible role of non-gravitational heating. The non-Gaussianity is significant and increases the cosmic variance of the power spectrum by a factor of ∼ 4 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 of ∼ 20% in the SZ measurement of power spectrum and ∼ 10% in the cross correlation with Sloan galaxies for 2000 < l < 5000. For cluster search, the optimal scan rate is around 140 hours per square degree with a cluster detection rate 1 every 4 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
We describe a fast method to simulate in a semi – analytical way consistent maps of the thermal , kinetic and polarised Sunyaev – Zel '-dovich effect , featuring both cluster spatial correlations and large – scale velocity flows .
متن کاملThe Thermal Sunyaev Zel ’ dovich effect : a powerful probe for missing baryons
About 90% of baryons in the universe have thus far escaped direct observation. This is known as the missing baryon problem. The Sunyaev Zel’dovich effect (SZ effect) has the potential to directly measure the state of the majority of these missing baryons. The next generation CMB experiments such as AMIBA will provide an unbiased sample of the intergalactic medium through the SZ effect. The exis...
متن کاملar X iv : a st ro - p h / 97 11 13 5 v 1 1 2 N ov 1 99 7 HOT ELECTRONS AND COLD PHOTONS : GALAXY CLUSTERS AND THE SUNYAEV - ZEL ’ DOVICH EFFECT
متن کامل
Sunyaev Zel ‘ dovich effect studies with MASTER
Our three frequencies radiometer MASTER, which allows low noise observations in three frequency intervals around 90, 220 and 345 GHz is being completed. We discuss the possibility of exploiting the MASTER's characteristics for studies of the Sunyaev Zel'dovich effect from the Antartic Plateau and propose an observational program from Dome C.
متن کامل0 v 1 2 4 A ug 1 99 8 Observations of the Sunyaev – Zel ’ dovich effect at high angular resolution towards the galaxy clusters A 665 , A 2163 and CL 0016 + 16
We report on the first observation of the Sunyaev–Zel'dovich (SZ) effect, a distortion of the Cosmic Microwave Background radiation (CMB) by hot electrons in clusters of galaxies, with the Diabolo experiment at the IRAM 30 m telescope. Diabolo is a dual–channel 0.1K bolometer photometer dedicated to the observation of CMB anisotropies at 2.1 and 1.2 mm. A significant brightness decrement in the...
متن کاملThe Sunyaev - Zel ’ dovich effect in a sample of 31 clusters - a comparison between the predicted and WMAP observed decrement
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...
متن کامل