Large‐Area Mapping at 850 Microns. I. Optimum Image Reconstruction from Chop Measurements

Abstract

We present results on the optimum reconstruction of chop data taken using the Submillimeter Common-User Bolometer Array on the James Clerk Maxwell Telescope. Using an artificial data set with known noise properties, we analyze three techniques for constructing images of the sky from the chop data: Emerson Fourier deconvolution, matrix inversion, and maximum entropy reconstruction. We conclude that a matrix inversion formulation via an iterative procedure produces the best image reconstructions. We apply the three reconstruction techniques to produce maps of the calibration point source CRL 618 and the rho Ophiuchi A core at 850 mum and use Wiener filtering to remove the high-frequency noise component from the matrix inversion method.