Planck 2015 results
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Fig. 20

image

Internal validation using Monte Carlo simulations to assess the recovery of the polarized flux density for the 30, 44, and 70 GHz channels. In these simulations, point sources were injected into the Q and U maps with 50 different polarized flux density values, starting at 0.2 Jy and increasing with a step size of 0.1 Jy. The fractional difference, defined as (recovered true)/true, is plotted against the true polarized flux density. The recovered polarized flux densities are unbiased, except for the faintest sources, were the effect of Eddington-type bias is seen.

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