The distribution of neutron star masses

From the beginning of current century to the present, the sample of observed neutron star (NS) with measured masses grew owing to the great effort in the observational field, and the so-called "canonical" unique value formerly attributed to NS at birth was put into question. Different groups pointed out the existence of different channels for a NS formation, possibly leading to a multimodal distribution. We employ in the present work tools from frequentist and Bayesian analysis to test some inferences about the mass distribution of neutron stars, in order to clarify if the observed objects belong to the same populations or show differences at the birth/evolutionary history.