Planck early results
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The flux density of a subset of ERCSC sources at 30 and 44 GHz, with color corrections, compared to the flux density obtained from VLA 22 and 43 GHz observations of the same sources translated to the Planck effective frequency (Planck Collaboration 2011j). The over-plotted lines are the first order polynomial resulting from an uncertainty weighted fit to the VLA and ERCSC flux densities which partially takes into account Eddington bias. The slope of the fit is 1.08 at 30 GHz and 1.02 at 44 GHz indicating that both measurements are in good agreement. The median ratio of the ERCSC flux density to the VLA flux density is 1.15 at both frequencies. The difference is most likely attributable to a combination of effects including cross-calibration uncertainties, contribution from fainter sources within the Planck beam, variability and the fact that the smaller beam VLA measurements would be less sensitive to low surface brightness emission beyond the 2−4″ primary VLA beam although care has been taken to use mainly unresolved sources.

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