Complex visibilities of cosmic microwave background anisotropies - art. no. 123001

We study the complex visibilities of the cosmic microwave background anisot ropies that are observables in interferometric observations of the cosmic m icrowave background, using the multipole expansion methods commonly adopted in analyzing single-dish experiments. This allows us to recover the proper ties of the visibilities that are obscured in the flat-sky approximation. D iscussions of the window function, multipole resolution, instrumental noise , pixelization, and polarization are given.