Can Extragalactic Foregrounds Explain the Large-Angle CMB Anomalies?

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Scientific paper

We address the effect of an extended local foreground on the low-ℓ anomalies found in the CMB. Recent X-ray catalogues point us to the existence of very massive superstructures at the 100 h-1 Mpc scale that contribute significantly to the dipole velocity profile. Being highly non-linear, these structures provide us a natural candidate to leave an imprint on the CMB sky via a local Rees-Sciama effect. We show that the Rees-Sciama effect of local foregrounds can induce CMB anisotropy of ΔT/T ~ 10-5 and we analyse its impact on multipole power as well as the induced phase pattern on largest angular scales.

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