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• W2468528080 abstract "The ellipticity and obliquity of the spots in the WMAP 5 year Q, V, W and VW maps has been investigated and compared to simulated maps. No significant excess ellipticity has been found. The ellipticity is found to be around ǫ ≈ 1.61 for spots larger than 20 pixels and higher for smaller spots; an effect attributed to noise. This is in agreement with what is found on simulated maps. Obliquity for maps varies depending on what great circle is used as equator with mean of e = 57.2955 when all possible such circles are considered. Obliquity result variation is higher as a function of what equator ring was is chosen for larger spots. This variation would seem to suggest a “preferred direction” on the CMB anisotropies, but detections of different “preferred directions” are made on simulated maps with almost as much significance. Also the results seem to be influenced by the mask and no certain detection of any preferred direction for the spots may be claimed from the obliquity data presented. The ellipticity data disagrees with earlier reports [1, 2, 3, 4] claiming significantly higher ellipticity in the WMAP data than can be found in simulated data. The results also disagree with findings that spots between 20 and 50 pixels show significantly higher ellipticity than spots of > 50 pixels. The obliquity result is consistent with what is reported by G.Gurzadyan et al [1, 2, 3, 4]." @default.
• W2468528080 created "2016-07-22" @default.
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• W2468528080 date "2009-01-01" @default.
• W2468528080 modified "2023-09-27" @default.
• W2468528080 title "Statistical Analysis of Ellipticity in Cosmic Microwave Background Anisotropies" @default.
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