Cosmic Microwave and Infrared Backgrounds cross-correlation for ISW detection

Abstract

We investigate the cross-correlation between the cosmic infrared and microwave backgrounds (CIB & CMB) anisotropies through the integrated Sachs-Wolfe effect. We first describe the CIB anisotropies using a linearly biased power spectrum, then derive the theoretical angular power spectrum of the CMB-CIB cross-correlation for different instruments and frequencies. We discuss the detectability of the ISW signal by performing a signal-to-noise (SNR) analysis with our predicted spectra. The significances obtained range from 6σ to 7σ in an ideal case, depending on the frequency ; in realistic cases which account for the presence of noise including astrophysical contaminants, the results span the range 2-5σ, depending strongly on the major contribution to the noise term.

4 pages, 1 table. Contribution to the proceedings of the International Conference on Gravitation and Cosmology, Goa, India, December, 2011

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• Planck Early Results XVIII: The power spectrum of cosmic infrared background anisotropies
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• Cross-correlation between the cosmic microwave and infrared backgrounds for integrated Sachs-Wolfe detection