Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-01-09
Astrophys.J.572:L27-L32,2002
Astronomy and Astrophysics
Astrophysics
changes to reflect version accepted by ApJ Letters
Scientific paper
10.1086/341484
We search the BOOMERanG maps of the anisotropy of the Cosmic Microwave Background (CMB) for deviations from gaussianity. In this paper we focus on analysis techniques in pixel-space, and compute skewness, kurtosis and Minkowski functionals for the BOOMERanG maps and for gaussian simulations of the CMB sky. We do not find any significant deviation from gaussianity in the high galactic latitude section of the 150 GHz map. We do find deviations from gaussianity at lower latitudes and at 410 GHz, and we ascribe them to Galactic dust contamination. Using non-gaussian simulations of instrumental systematic effects, of foregrounds, and of sample non-gaussian cosmological models, we set upper limits to the non-gaussian component of the temperature field in the BOOMERanG maps. For fluctuations distributed as a 1 DOF $\chi^2$ mixed to the main gaussian component our upper limits are in the few % range.
Ade Peter A. R.
Bock James Joseph
Bond Richard J.
Borrill Julian
Boscaleri Andrea
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