A comparative study of non-Gaussianity in ILC-7yr CMB map
  A detection or non detection of primordial non--Gaussianity (NG) by using the
cosmic microwave background radiation (CMB) is a possible way to break the
degeneracy of early universe models. Since a single statistical estimator
hardly can be sensitive to all possible forms of NG which may be present in the
data, it is important to use different statistical estimators to study NG in
CMB. Recently, two new large-angle NG indicators based on skewness and kurtosis
of spherical caps or spherical cells of CMB sky have been proposed and used in
both CMB data and simulated maps. Here, we make a comparative study of these
two different procedures by examining the NG in the WMAP seven years ILC map.
We show that the spherical cells procedure detects a higher level of NG than
that obtained by the method with overlapping spherical caps.
