Planck 2018 results
Open Access

Fig. 82.


Comparison of the residuals of the coadded TT spectrum with the difference between the ΛCDM and ΛCDM+AL best-fit models. The green points show the coadded TT data when using the foreground parameters obtained with a ΛCDM best fit, while the orange points are obtained using the foreground parameters from a ΛCDM+AL one. In both cases, we display the residual to the best-fit ΛCDM cosmology (using the PlanckTT+lowE likelihood) in bins of size Δ  =  50 and we shift the bin locations slightly to improve legibility. The blue line is the difference between the AL and ΛCDM best-fit models obtained using the PlanckTT+lowE likelihood, while the black dashed line is obtained with the Planck TT,TE,EE+lowE likelihood. The thin grey line gives a sense of the scale of the residuals by displaying the TT power spectrum divided by 100. The residuals display an approximately oscillatory behaviour, which does not seem to be statistically anomalous, but which appears to roughly match the particular oscillatory feature of the AL effect. The difference between the two residuals shows the degeneracy between AL and the foreground parameters. We discuss in the text how fixing the foreground parameters to their ΛCDM values decreases the AL deviation from unity by about 1 σ.

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