We investigate the effects of 1/f noise on the ability of a particular classof Cosmic Microwave Background experiments to measure the angular powerspectrum of temperature anisotropy. We concentrate on experiments that operateprimarily in raster-scan mode and develop formalism that allows us to calculateanalytically the effect of 1/f noise on power spectrum sensitivity for thisclass of experiments and determine the benefits of raster-scanning at differentangles relative to the sky field versus scanning at only a single angle(cross-linking versus not cross-linking). We find that the sensitivity of suchexperiments in the presence of 1/f noise is not significantly degraded atmoderate spatial scales (l ~ 100) for reasonable values of scan speed and 1/fknee. We further find that the difference between cross-linked andnon-cross-linked experiments is small in all cases and that thenon-cross-linked experiments are preferred from a raw sensitivity standpoint inthe noise-dominated regime -- i.e., in experiments in which the instrumentnoise is greater than the sample variance of the target power spectrum at thescales of interest. This analysis does not take into account systematiceffects.
展开▼
