摘要：We present an analysis of the effects of beam deconvolution on noise properties in CMB
measurements. The analysis is built around the artDeco beam deconvolver code. We derive a
low-resolution noise covariance matrix that describes the residual noise in deconvolution
products, both in harmonic and pixel space. The matrix models the residual correlated
noise that remains in time-ordered data after destriping, and the effect of deconvolution
on this noise. To validate the results, we generate noise simulations that mimic the data
from the Planck LFI instrument. A χ2 test for the
full 70 GHz covariance in multipole range ℓ = 0 − 50 yields a mean reduced χ2 of 1.0037. We
compare two destriping options, full and independent destriping, when deconvolving subsets
of available data. Full destriping leaves substantially less residual noise, but leaves
data sets intercorrelated. We also derive a white noise covariance matrix that provides an
approximation of the full noise at high multipoles, and study the properties on
high-resolution noise in pixel space through simulations.
关键词：cosmic background radiation;methods: numerical;methods: data
analysis
