Searching for Non-Gaussian Signals in the BOOMERANG 2003 CMB Maps

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 nonlinear coupling parameter f$_{NL$ as -300\ltf$_NL$\lt650 at 68\% CL and -800\ltf$_NL$\lt1050 at 95\% CL. }