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We present a Gaussianity analysis of the Archeops Cosmic Microwave Background(CMB) temperature anisotropy data maps at high resolution to constrain thenon-linear coupling parameter fnl characterising well motivated non-GaussianCMB models. We used the data collected by the most sensitive Archeops bolometerat 143 GHz. The instrumental noise was carefully characterised for thisbolometer, and for another Archeops bolometer at 143 GHz used for comparison.Angular scales from 27 arcmin to 1.8 degrees and a large fraction of the sky,21 %, covering both hemispheres (avoiding pixels with Galactic latitude |b| <15 degrees) were considered.  The three Minkowski functionals on the sphere evaluated at differentthresholds were used to construct a chi-squared statistics for both theGaussian and the non-Gaussian CMB models. The Archeops maps were produced withthe Mirage optimal map-making procedure from processed time ordered data. Theanalysis is based on simulations of signal (Gaussian and non-Gaussian fnl CMBmodels) and noise which were processed in the time domain using the Archeopspipeline and projected on the sky using the Mirage optimal map-makingprocedure.  The Archeops data were found to be compatible with Gaussianity after removalof highly noisy pixels at high resolution. The non-linear coupling parameterwas constrained to -400 < fnl < 590 at 68% CL and -920 < fnl < 1075 at 95% CL,for realistic non-Gaussian CMB simulations.

Constraints on the non-linear coupling parameter fnl with the Archeops data