2004/06/16 by Simon Prunet, Jean-Philippe Uzan, Francis Bernardeau +1 · 1 citation
Physics and Astronomy · #astro-ph
paper · pdf · doi:10.1103/physrevd.71.083508
published as Phys.Rev. D71 (2005) 083508 · 14 pages, 14 figures
arxiv created 2004/06/16 · arxiv updated 2009/12/01
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 Δℓ=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.