Primordial Non-Gaussianity and Bispectrum Measurements in the Cosmic Microwave Background and Large-Scale Structure

Figure 9

(a) The KQ75 galactic and point-source mask used for non-Gaussian analysis of WMAP data. (b) Anisotropic distribution of the noise for a coadded map of the WMAP V and W frequency channels. These two features break rotational invariance of the observed CMB sky and spoil the optimality of the standard cubic statistic (72), unless an additional “linear term” is included, as explained in the main text. Data are obtained from the LAMBDA website, http://lambda.gsfc.nasa.gov/index.cfm.

(a)

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