On the effect of cosmic rays in bolometric CMB measurements from the stratosphere

摘要: Context. Precision measurements of the anisotropy cosmic microwave background (CMB) are able to detect low-level nonGaussian features caused by either topological defects or t he inflation process. These becoming feasa ble with development large arrays ultra-sensitive bolometric detectors and their use in balloon-borne satellite missi ons. However, space environment includes a population rays (CRs), which produce spurious spikes signals. Aims. We analyze effect CRs on measurement CMB maps estimate cosmological non-Gaussianity angular power spectra CMB. Methods. Using accurate simulations noise CR events detectors, de-spiking techniques, we simulated measured Gaussianity spectrum for different levels rates events. Results. find that technique based outlier removal i n detector signals contributing same sky pixel is effective removing larger than noise. low level hidden positive shift average signal bolometer, increase its variance. If number hits per enough, data distribution each approximately Gaussian, but skewness kurtosis temperatures pixels indicate presence some non-Gaussianity. The standard estimation pipeline produces bias at high multipoles. Conclusions. In case typical survey, CR-induced will be marginally detectable membrane bolometer channels, negligible spider-web channels. experiments sensitivity better 100� K= p Hz, an less favorable earth stratosphere, likely significant ly