Searching for non-Gaussian signals in the BOOMERanG 2003 CMB map: Preliminary results

We analyze the BOOMERanG 2003 (B03) 145 GHz temperature map to constrain the amplitude
of a non Gaussian, primordial contribution to CMB fluctuations. We perform a pixel space analysis
restricted to a portion of the map chosen in view of high sensitivity, very low foreground contamination
and tight control of systematic effects. We set up an estimator based on the three Minkowski
functionals which relies on high quality simulated data, including non Gaussian CMB maps. We find
good agreement with the Gaussian hypothesis and derive the first limits based on BOOMERanG data
for the non linear coupling parameter fNL as −300 < fNL < 650 at 68% CL and −800 < fNL < 1050
at 95% CL.

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