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

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arxiv astro-ph/0406364 v1 pith:2DULXFNW submitted 2004-06-16 astro-ph

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

classification astro-ph
keywords modulationdataestimatorfoundwmapaimingapplyingargue
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abstract

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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