CMB-Normalized Predictions for Sunyaev-Zel'dovich effect fluctuations

Abstract

We predict the level of small-scale anisotropy in the cosmic microwave background (CMB) due to the Sunyaev--Zel'dovich (SZ) effect for the ensemble of cosmological models that are consistent with current measurements of large-scale CMB anisotropy. We argue that the recently reported detections of the small-scale (arcminutes) CMB anisotropy are only marginally consistent with being the SZ effect when cosmological models are calibrated to the existing primary CMB data on large scales. The discrepancy is at more than 2-2.5 sigma, and is mainly due to a lower sigma_8 <0.8 favored by the primary CMB and a higher sigma_8 > 1 favored by the SZ effect. A degeneracy between the optical depth to Thomson scattering and the CMB-derived value of sigma_8 suggests that the discrepancy is reduced if the universe was reionized very early, at a redshift of about 25.

4 pages, 2 figures, submitted to ApJL

References in corpus (10)

• Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant
• The 2dF Galaxy Redshift Survey: The amplitudes of fluctuations in the 2dFGRS and the CMB, and implications for galaxy biasing
• Universal gas density and temperature profile
• Is cosmology consistent?
• II: Bayesian Methods for Cosmological Parameter Estimation from Cosmic Microwave Background Measurements
• Reproducing Cosmic Microwave Background anisotropies with mixed isocurvature perturbations
• Non-Gaussian Aspects of Thermal and Kinetic Sunyaev-Zel'dovich Effects
• The Sunyaev Zel'dovich effect: simulation and observation
• Measurement of Arcminute Scale Anisotropy with the BIMA Array
• On the density of Cold Dark Matter

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• The Sunyaev-Zeldovich Background
• Discriminating between unresolved point sources and "negative" SZ clusters in CMB maps
• On the Angular Correlation Function of SZ Clusters : Extracting cosmological information from a 2D catalog
• Status of CMB Polarization Measurements from DASI and Other Experiments
• Statistical Imprints of SZ Effects in the Cosmic Microwave Background