Constraints on mode couplings and modulation of the CMB with WMAP data

Details Constraints on mode couplings and modulation of the CMB with WMAP data Constraints on mode couplings and modulation of the CMB with WMAP data

2004-06-16

arxiv.org/abs/astro-ph/0406364v1

Phys.Rev. D71 (2005) 083508

Astronomy and Astrophysics

Astrophysics

14 pages, 14 figures

Scientific paper

10.1103/PhysRevD.71.083508

We investigate a possible asymmetry in the statistical properties of the cosmic microwave background temperature field and to do so we construct an estimator aiming at detecting a dipolar modulation. Such a modulation is found to induce correlations between multipoles with $\Delta\ell=1$. Applying this estimator, to the V and W bands of the WMAP data, we found a significant detection in the V band. We argue however that foregrounds and in particular point sources are the origin of this signal.

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