Can extragalactic foregrounds explain the large-angle CMB anomalies?

Details Can extragalactic foregrounds explain the large-angle CMB anomalies? Can extragalactic foregrounds explain the large-angle CMB anomalies?

2006-09-07

arxiv.org/abs/astro-ph/0609188v2

Astronomy and Astrophysics

Astrophysics

6 pages, 2 figures; Talk given at 11th Marcel Grossmann meeting, Berlin 2006; includes WMAP(3yr) update of astro-ph/0601445; m

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 DeltaT/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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