de Troia, G.G.de TroiaHikage, C.C.HikagePolenta, GianlucaGianlucaPolenta2020-09-172020-09-172010-11-01https://hdl.handle.net/20.500.13025/1976Monthly Notices of the Royal Astronomical Society, Volume 408, Issue 3, pp. 1658-1665.We use Minkowski functionals (MFs) to constrain a primordial non-Gaussian contribution to the cosmic microwave background intensity field as observed in the 150- and 145-GHz BOOMERanG maps from the 1998 and 2003 flights, respectively, performing for the first time a joint analysis of the two data sets. A perturbative expansion of the MF formulae in the limit of a weakly non-Gaussian field yields analytical formulae, derived by Hikage et al., which can be used to constrain the coupling parameter f<SUB>NL</SUB> without the need for non-Gaussian simulations. We find -770 < f<SUB>NL</SUB> < 500 at 95 per cent CL, significantly improving the previous constraints by De Troia et al. on the BOOMERanG 2003 data set. These are the best f<SUB>NL</SUB> limits to date for suborbital probes.methods analyticalmethods statisticalearly Universecosmic background radiationcosmology observations10.1111/j.1365-2966.2010.17228.xhttp://adsabs.harvard.edu/abs/2010MNRAS.408.1658N2010MNRAS.408.1658N