INTERFEROMETRIC MEASUREMENTS OF ANNULUS-FILTERED POLARIZATIONS PATTERNS IN THE CMB

Abstract

Due to the finite-size beam, interferometry observations of the CMB polarization tend to measure a mixture of E and B modes arising from uw-space smearing. We propose an interferometry observation strategy that can disentangle the polarization E and B modes in a clean manner. This strategy employs a similar principle as that of the single-dish observation proposed earlier, but requiring additional linear combinations of signals measured from different baselines. In this work, we consider a hexagonally packed interferometry array as an example to demonstrate the ultility and efficiency of the proposed method. The measurement from a unit cell of equilateral triangular baselines in interferometry measurement is found to be comparable to that from a single dish in single-dish measurements.