Cosmic microwave and infrared backgrounds cross-correlation for ISW detection

7th International Conference on Gravitation and Cosmology

Ilic´, S.^1,2

Université Paris-Sud, Institut d'Astrophysique Spatiale, UMR8617, Orsay, F-91405, France^1

CNRS, Orsay, F-91405, France^2

关键词: Angular power spectrum;    Cosmic microwaves;    Cross correlations;    Detectability;    Infrared background;    Microwave background;    Noise terms;    Signal to noise;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/484/1/012034/pdf
DOI  :  10.1088/1742-6596/484/1/012034

来源: IOP

【 摘 要 】

We have investigated the cross-correlation between the cosmic infrared and microwave backgrounds (CIB and CMB) anisotropies through the integrated Sachs-Wolfe effect. We have first described 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 have discussed 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.