期刊
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
卷 16, 期 2-3, 页码 411-420出版社
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0218271807010195
关键词
observational cosmology; cosmic microwave background; large-scale anisotropies in CMB; large-angle anomalies in CMB
资金
- Science and Technology Facilities Council [PP/C50209X/1] Funding Source: researchfish
- STFC [PP/C50209X/1] Funding Source: UKRI
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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