A note on the large-angle anisotropies in the WMAP cut-sky maps

Details A note on the large-angle anisotropies in the WMAP cut-sky maps A note on the large-angle anisotropies in the WMAP cut-sky maps

2007-06-05

arxiv.org/abs/0706.0575v1

Int.J.Mod.Phys.D16:411-420,2007

Astronomy and Astrophysics

Astrophysics

10 pages, 3 figeres. We performed a similar analysis of arXiv:astro-ph/0511666 by considering the LILC map with a Kp2 sky cut,

Scientific paper

10.1142/S0218271807010195

Recent analyses of the WMAP data seem to indicate the possible presence of large-angle anisotropy in the Universe. If confirmed, these can have important consequences for our understanding of the Universe. A number of attempts have recently been made to establish the reality and nature of such anisotropies in the CMB data. Among these is a directional indicator recently proposed by the authors. A distinctive feature of this indicator is that it can be used to generate a sky map of the large-scale anisotropies of the CMB maps. Applying this indicator to full-sky temperature maps we found a statistically significant preferred direction. The full-sky maps used in these analyses are known to have residual foreground contamination as well as complicated noise properties. Thus, here we performed the same analysis for a map where regions with high foreground contamination were removed. We find that the main feature of the full-sky analysis, namely the presence of a significant axis of asymmetry, is robust with respect to this masking procedure. Other subtler anomalies of the full-sky are on the other hand no longer present.

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