Skew spectrum and smoothed skewness of 21-cm signals from epoch of reionization

Due to the non-linear ionizing and heating processes, 21-cm signals from epoch of reionization (EoR) are expected have strong non-Gaussian fluctuations. In this paper, we use semi-numerical simulations study statistics i.e. skew spectrum smoothed skewness EoR. We find similar evolution features with bispectrum. All them sensitive EoR models, while not too much cosmic volume applied. With SKA1-low telescope as reference, both higher S/N ratios than