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Recent Planck results have shown that radiation from the cosmic microwavebackground passes through foregrounds in which aligned dust grains producepolarized dust emission, even in regions of the sky with the lowest level ofdust emission. One of the most commonly used ways to remove the dust foregroundis to extrapolate the polarized dust emission signal from frequencies where itdominates (e.g., ~ 350 GHz) to frequencies commonly targeted by cosmicmicrowave background experiments (e.g., ~150 GHz). In this paper, we describean interstellar medium effect that can lead to decorrelation of the dustemission polarization pattern between different frequencies due to multiplecontributions along the line of sight. Using a simple 2-cloud model we showthat there are two conditions under which this decorrelation can be large: (a)the ratio of polarized intensities between the two clouds changes between thetwo frequencies; (b) the magnetic fields between the two clouds contributingalong a line of sight are significantly misaligned. In such cases, the 350 GHzpolarized sky map is not predictive of that at 150 GHz. We propose a possiblecorrection for this effect, using information from optopolarimetric surveys ofdichroicly absorbed starlight.

Searching for Inflationary B-modes: Can dust emission properties be extrapolated from 350 GHz to 150 GHz?